Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards....
Transcript of Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards....
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Clinton Gormley @clintongormley
Elasticsearch Query DSL … not just for wizards
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elasticsearch.org/guide
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elasticsearch
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elasticsearch• real-time
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elasticsearch• real-time • distributed
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elasticsearch• real-time • distributed • search
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elasticsearch• real-time • distributed • search • analytics
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mapping
analysis query dsl
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mapping
analysis query dsl
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query dsl
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query dslflexible, powerful query language
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queries• relevance • full text • not cached • slower
filters• boolean yes/no • exact values • cached • faster
Filter first, then query remaining docs
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GET /_search
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GET /_search{ "query": {...} }
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GET /_search{ "query": { "match": { "title": "search" }} }
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GET /_search{ "query": { match_all: {}} }
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GET /_search{ "query": { match_all: {}} }
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GET /_search{ "query": { "filtered": { "query": {...}, "filter": {...} } } }
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GET /_search{ "query": { "filtered": { "query": { "match": { "title": "search" }}, "filter": {...} } } }
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GET /_search{ "query": { "filtered": { "query": { "match": { "title": "search" }}, "filter": { "term": { "status": "active" }} } } }
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GET /_search{ "query": { "filtered": { "query": { "match_all": {}}, "filter": { "term": { "status": "active" }} } } }
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GET /_search{ "query": { "filtered": { "query": { "match_all": {}}, "filter": { "term": { "status": "active" }} } } }
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how data is indexed
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
where content like “%brown%fox%”
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
slow & inflexible
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
“analysis”
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } !{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
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{ "title": [quick,brown,rabbits], "content": [brown,rabbits,are,commonly,seen] } !{ "title": [keeping,pets,healthy], "content": [my,quick,brown,fox,eats,rabbits,on,a, regular,basis] }
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Term Doc 1 Doc 2aarebasisbrowncommonlyeatsfoxmyonquickrabbitsregularseen
field: content
sorted list of unique terms
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Term Doc 1 Doc 2aarebasisbrowncommonlyeatsfoxmyonquickrabbitsregularseen
field: content
where they occur
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Term Doc 1 Doc 2aarebasisbrowncommonlyeatsfoxmyonquickrabbitsregularseen
field: content
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Term Doc 1 Doc 2aarebasisbrowncommonlyeatsfoxmyonquickrabbitsregularseen
field: content
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inverted index
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inverted indexnot just for text
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inverted indexnumbers, dates, bools, enums
geopoints, geoshapes, etc
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WHERE field = "value"
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WHERE field CONTAINS "value"
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WHERE field CONTAINS "value"
term filter
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"term": { "title": "brown" }
WHERE field CONTAINS "value"
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GET /_search{ "query": { !!!! } }
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GET /_search{ "query": { "filtered": { !! } } }
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GET /_search{ "query": { "filtered": { "query": { ... }, "filter": { ... } } } }
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GET /_search{ "query": { "filtered": { "query": { "match_all": {} }, "filter": { ... } } } }
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GET /_search{ "query": { "filtered": { "query": { "match_all": {} }, "filter": { ... } } } }
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GET /_search{ "query": { "filtered": { "query": { "match_all": {} }, "filter": { "term": { "title": "brown" }} } } }
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Term Doc 1 Doc 2brownhealthykeepingpetsquickrabbits
field: title
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Term Doc 1 Doc 2brownhealthykeepingpetsquickrabbits
field: title
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"term": { "title": "brown" }
➔ result: bitset[ 1, 0 ]
➔ cache as: "title:brown"
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WHERE field IN ["val",…]
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WHERE field IN ["val",…]
terms filter
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"terms": { "title": ["quick", "pets"] }
WHERE field IN ["val",…]
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Term Doc 1 Doc 2brownhealthykeepingpetsquickrabbits
field: title
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"terms": { "title": ["quick","pets"] }
➔ result: bitset[ 1, 1 ]
➔ cache as: "title:quick title:pets"
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WHERE field >= "val1" AND field < "val2"
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WHERE field >= "val1" AND field < "val2"
range filter
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"range": { "content":{ "gte": "a", "lt": "m" } }
WHERE field >= "val1" AND field < "val2"
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Term Doc 1 Doc 2aarebasisbrowncommonlyeatsfoxmyonquickrabbitsregularseen
field: content
![Page 61: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/61.jpg)
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➔ result: bitset[ 1, 1 ]
➔ cache as: "content:[a TO m}"
"range": { "content":{ "gte": "a", "lt": "m" } }
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"range": { "date":{ "gte": "2014-‐01-‐01", "lt": "2041-‐02-‐01" } }
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"range": { "date":{ "gte": "2014-‐01-‐01", "lt": "2041-‐02-‐01" } }
numeric/date fields optimised
for range filters
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"range": { "date":{ "gte": "now -‐ 1h" } }
not cached
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"range": { "date":{ "gte": "now -‐ 1h / h" } }
cached
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WHERE field IS NOT NULL
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WHERE field has any term
![Page 68: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/68.jpg)
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WHERE field has any term
exists filter
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"exists": { "field": "title" }
WHERE field has any term
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missing filter
WHERE field has no term
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"missing": { "field": "title" }
WHERE field has no term
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AND … OR … NOT
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AND … OR … NOT
bool filter
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"bool": { "must": [ <filters> ], "should": [ <filters> ], "must_not": [ <filters> ] }
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"bool": { "must": [ <filters> ], # AND "should": [ <filters> ], "must_not": [ <filters> ] }
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"bool": { "must": [ <filters> ], "should": [ <filters> ], # OR "must_not": [ <filters> ] }
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"bool": { "must": [ <filters> ], "should": [ <filters> ], "must_not": [ <filters> ] # NOT }
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"bool": { "must": { "term": { "title": "rabbits" }}, !!!!!}
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"bool": { "must": { "term": { "title": "rabbits" }}, "should": [ { "term": { "title": "quick" }}, { "term": { "content": "quick" }} ], !}
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"bool": { "must": { "term": { "title": "rabbits" }}, "should": [ { "term": { "title": "quick" }}, { "term": { "content": "quick" }} ], "must_not": { "term": { "content": "fox" }} }
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"bool": { "must": [ { "bool": { "should": [ { "term": { "title": "rabbits" }}, { "term": { "content": "rabbits" }} ]}}, { "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "content": "quick" }} ]}} ], "must_not": { "term": { "content": "fox" }} }
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"bool": { "must": [ { "bool": { "should": [ { "term": { "title": "rabbits" }}, { "term": { "content": "rabbits" }} ]}}, { "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "content": "quick" }} ]}} ], "must_not": { "term": { "content": "fox" }} }
not cached
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"bool": { "must": [ { "bool": { "should": [ { "term": { "title": "rabbits" }}, { "term": { "content": "rabbits" }} ]}}, { "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "content": "quick" }} ]}} ], "must_not": { "term": { "content": "fox" }} }
cached
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result bitset = ! (title:rabbits OR content:rabbits) AND (title:quick OR content:quick) AND NOT content:fox
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filters• boolean yes/no • exact values • cached • faster
Filter first, then query
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how relevant is this term?
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how relevant is this term?term query
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≈ term filter + relevance
how relevant is this term?term query
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"term": { "title": "brown" }
how relevant is this term?
![Page 90: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/90.jpg)
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GET /_search{ "query": { !!! } }
![Page 91: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/91.jpg)
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GET /_search{ "query": { "term": { "title": "brown" } } }
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{ "_index": "myindex", "_type": "mytype", "_id": "1", "_score": 0.5, "_source": { "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" } }
how relevant is this doc?
![Page 93: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/93.jpg)
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relevance scoreHow common is the term in this doc? ➔ more is better
![Page 94: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/94.jpg)
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relevance scoreHow common is the term in this doc? ➔ more is better How common is the term in ALL docs? ➔ less is better
![Page 95: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/95.jpg)
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relevance scoreHow common is the term in this doc? ➔ more is better How common is the term in ALL docs? ➔ less is better How long is this doc? ➔ shorter is better
![Page 96: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/96.jpg)
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lucene similarityHow common is the term in this doc? ➔ more is better How common is the term in ALL docs? ➔ less is better How long is this doc? ➔ shorter is better
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lucene similarityHow common is the term in this doc? ➔ more is better How common is the term in ALL docs? ➔ less is better How long is this doc? ➔ shorter is better
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Term frequency !
How common is the term in ALL docs? ➔ less is better How long is this doc? ➔ shorter is better
lucene similarity
![Page 99: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/99.jpg)
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Term frequency !
How common is the term in ALL docs? ➔ less is better How long is this doc? ➔ shorter is better
lucene similarity
![Page 100: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/100.jpg)
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Term frequency !
Inverse document frequency !
How long is this doc? ➔ shorter is better
lucene similarity
![Page 101: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/101.jpg)
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Term frequency !
Inverse document frequency !
How long is this doc? ➔ shorter is better
lucene similarity
![Page 102: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/102.jpg)
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Term frequency !
Inverse document frequency !
Length norm
lucene similarity
![Page 103: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/103.jpg)
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AND … OR … NOT
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AND … OR … NOT
bool query
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like bool filter, but different...
AND … OR … NOT
bool query
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"bool": { "must": [ <queries> ], # AND "should": [ <queries> ], "must_not": [ <queries> ] # NOT }
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"bool": { "must": [ <queries> ], # AND "should": [ <queries> ], # Hmmm "must_not": [ <queries> ] # NOT }
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"bool": { "must": [ <queries> ], # AND "should": [ <queries> ], # Hmmm "must_not": [ <queries> ], # NOT "minimum_should_match": ? # Hmmm }
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no "must" queries
at least one must match
"bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ] }
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no "must" queries
minimum_should_match = 1
"bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ] }
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"bool": { "must": { "term": { "title": "quick"}}, "should": [ { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ] }
with "must" queries
all are optional!
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"bool": { "must": { "term": { "title": "quick"}}, "should": [ { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ] }
with "must" queries
minimum_should_match = 0
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bool filter ➔ T/F !
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bool filter ➔ T/F !
bool query ➔ _score
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_score of bool query =
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_score of bool query = sum( _score of each query)
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_score of bool query = sum( _score of each query) * num of matching queries
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_score of bool query = sum( _score of each query) * num of matching queries / num of queries
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more matching should queries
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more matching should queries ==
better relevance score
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trim the long tail"bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ] }
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trim the long tail"bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ], "minimum_should_match": "75%" }
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trim the long tail"bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "rabbits" }} ], "minimum_should_match": "75%" # 2 of 3 }
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match query
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match queryhigh level query
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match queryhigh level query
understands mapping & analysis
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match query➔ analyze query string ➔ rewrite query
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one word query
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{ "match": { "title": "QUICK!" }}
title:quick
{ "term": { "title": "quick" }}
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multi word query
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{ "match": { "title": "QUICK FOX!" }}
title:quick OR title:fox
{ "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "fox" }} ] }}
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all words must match
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{ "match": { "title": "QUICK FOX!" } }
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{ "match": { "title": { "query": "QUICK FOX!", ! } } }
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{ "match": { "title": { "query": "QUICK FOX!", "operator": "and" } } }
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{ "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "fox" }} ] } }
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{ "bool": { "must": [ { "term": { "title": "quick" }}, { "term": { "title": "fox" }} ] } }
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trim long tail
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{ "match": { "title": { "query": "QUICK BROWN FOX!", "minimum_should_match": "75%" } } }
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{ "bool": { "should": [ { "term": { "title": "quick" }}, { "term": { "title": "brown" }}, { "term": { "title": "fox" }} ], "minimum_should_match": 2 } }
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fuzzy querieslevenshtein edit distance
![Page 142: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/142.jpg)
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bron ➔ brown
insertion
![Page 143: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/143.jpg)
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bron ➔ brown
foxs ➔ fox
deletion
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bron ➔ brown
foxs ➔ fox
kiuck ➔ qiuck
substitution
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bron ➔ brown
foxs ➔ fox
kiuck ➔ qiuck ➔ quick
transposition
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{ "match": { "title": { "query": "KIUCK BRON FOXS!", "fuzziness": "AUTO" } }
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phrase / proximity
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{ "match_phrase": { "title":"QUICK BROWN FOX!" } }
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{ "match_phrase": { "title": { "query": "BROWN QUICK FOX!", "slop": "10" } } }
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combine queries
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"bool": { "must": { <min_should_match> }, "should": [ { <fuzzy> }, { <proximity> } ] }
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"bool": { "must": { <min_should_match> }, "should": [ { <fuzzy> }, { <proximity> } ] }
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! "match": { "title": { "query": "<words>", "minimum_should_match": "75%" } } !
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"bool": { "must": { <min_should_match> }, "should": [ { <fuzzy> }, { <proximity> } ] }
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! "match": { "title": { "query": "<words>", "fuzziness": "AUTO" } } !
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"bool": { "must": { <min_should_match> }, "should": [ { <fuzzy> }, { <proximity> } ] }
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! "match_phrase": { "title": { "query": "<words>", "slop": "10" } } !
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"bool": { "must": { <min_should_match> }, "should": [ { <fuzzy> }, { <proximity> } ] }
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multi-field queries
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easy!
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"bool": { "should": [ { "match": {"first": "Reginald" }}, { "match": {"middle": "Kenneth" }}, { "match": {"last": "Dwight" }} ], "minimum_should_match": "75%" }
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hard!
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"bool": { "should": [ { "match": { "title": "quick brown fox" }}, { "match": { "content": "quick brown fox" }} ] }
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" }
{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" }
{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
better match
![Page 168: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/168.jpg)
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" }
{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
But 2 matches wins
![Page 169: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/169.jpg)
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all docs which match any query
dis_max query
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all docs which match any query
dis_max query
_score = best matching query
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"bool": { "should": [ { "match": { "title": "quick brown fox" }}, { "match": { "content": "quick brown fox" }} ] }
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"dis_max": { "queries": [ { "match": { "title": "quick brown fox" }}, { "match": { "content": "quick brown fox" }} ] }
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" }
{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
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{ "title": "Quick brown rabbits", "content": "Brown rabbits are commonly seen" }
{ "title": "Keeping pets healthy", "content": "My quick brown fox eats rabbits on a regular basis" }
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"dis_max": { "queries": [ { "match": { "title": "quick brown fox" }}, { "match": { "content": "quick brown fox" }} ], "tie_breaker": 0.2 }
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all docs which match any query
dis_max query
_score = best matching query + tie_breaker * others
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multi_match query
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match query on multiple fields
multi_match query
![Page 179: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/179.jpg)
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"dis_max": { "queries": [ { "match": { "title": "quick brown fox" }}, { "match": { "content": "quick brown fox" }} ], "tie_breaker": 0.2 }
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"multi_match": { "query": "quick brown fox", "fields": [ "title", "content" ] "tie_breaker": 0.2 }
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"multi_match": { "query": "quick brown fox", "fields": [ "title", "content" ] "tie_breaker": 0.2, # "type": "best_fields" }
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find whole "concept" in one field
best_fields
![Page 183: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/183.jpg)
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"quick brown fox" in title or content
best_fields
![Page 184: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/184.jpg)
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best_fields
dis_max"quick brown fox" in title or content
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"title": { "type": "string" }
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"title": { "type": "string", "fields": { !!!!!!!}}
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"title": { "type": "string", "fields": { "stemmed": { "type": "string", "analyzer": "english" } !!!}}
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"title": { "type": "string", "fields": { "stemmed": { "type": "string", "analyzer": "english" }, "autocomplete": { "type": "string", "analyzer": "edge_ngrams" }}}
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title: [ brown, fox, jumped ] !
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title: [ brown, fox, jumped ] !title.stemmed: [ brown, fox, jump ] !
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title: [ brown, fox, jumped ] !title.stemmed: [ brown, fox, jump ] !title.autocomplete [ b, br, bro, brow, brown, f, fo, fox, j, ju, jum, jump, jumpe, jumped ]
![Page 192: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/192.jpg)
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"multi_match": { "query": "quick brown fox", "fields": [ "title", "title.stemmed", "title.autocomplete" ] "type": "most_fields" }
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most_fieldsmatch same text
analyzed in different ways
![Page 194: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/194.jpg)
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most_fieldsmore matching fields = better
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most_fields
boolmore matching fields = better
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{ "first": "Reginald", "middle": "Kenneth" "last": "Dwight" }
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"multi_match": { "query": "Reginald Kenneth Dwight", "fields": [ "first", "middle", "last" ] !}
![Page 198: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/198.jpg)
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"multi_match": { "query": "Reginald Kenneth Dwight", "fields": [ "first", "middle", "last" ] "type": "????" }
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"multi_match": { "query": "Reginald Kenneth Dwight", "fields": [ "first", "middle", "last" ] "type": "most_fields" }
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problemfield centric
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( first: Reginald OR first: Kenneth OR first: Dwight ) OR ( middle:Reginald OR middle:Kenneth OR middle:Dwight ) OR ( last: Reginald OR last: Kenneth OR last: Dwight )
![Page 202: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/202.jpg)
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( first: Reginald OR first: Kenneth OR first: Dwight ) OR ( middle:Reginald OR middle:Kenneth OR middle:Dwight ) OR ( last: Reginald OR last: Kenneth OR last: Dwight )
![Page 203: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/203.jpg)
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problemoperator: and
![Page 204: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/204.jpg)
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( first: Reginald AND first: Kenneth AND first: Dwight ) OR ( middle:Reginald AND middle:Kenneth AND middle:Dwight ) OR ( last: Reginald AND last: Kenneth AND last: Dwight )
![Page 205: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/205.jpg)
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( first: Reginald AND first: Kenneth AND first: Dwight ) OR ( middle:Reginald AND middle:Kenneth AND middle:Dwight ) OR ( last: Reginald AND last: Kenneth AND last: Dwight )
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problemterm frequencies
first:dwight ➔ common last: dwight ➔ uncommon
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solution
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index time solutionsingle "fullname" field
![Page 209: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/209.jpg)
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"first": { "type": "string" }, "middle": { "type": "string" }, "last": { "type": "string" } !
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"first": { "type": "string" }, "middle": { "type": "string" }, "last": { "type": "string" }, "full": { "type": "string" } !
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"first": { "type": "string", "copy_to": "full" }, "middle": { "type": "string", "copy_to": "full" }, "last": { "type": "string", "copy_to": "full" }, "full": { "type": "string" } !
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"match": { "full": "Reginald Kenneth Dwight", "minimum_should_match": "75%" }
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query time solutionterm-centric query
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( first: Reginald AND first: Kenneth AND first: Dwight ) OR ( middle:Reginald AND middle:Kenneth AND middle:Dwight ) OR ( last: Reginald AND last: Kenneth AND last: Dwight )
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( first: Reginald OR middle:Reginald OR last: Reginald ) AND ( first: Kenneth OR middle:Kenneth OR last: Kenneth ) AND ( first: Dwight OR middle:Dwight OR last: Dwight )
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blend(first,middle,last):Reginald AND blend(first,middle,last):Kenneth AND blend(first,middle,last):Dwight
blends term frequencies
![Page 217: Elasticsearch Query DSL - Berlin Buzzwords · Elasticsearch Query DSL … not just for wizards. Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written](https://reader031.fdocuments.in/reader031/viewer/2022022523/5b39d64a7f8b9a40428ef54a/html5/thumbnails/217.jpg)
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cross_fieldsquery multiple fields as if they were one
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"multi_match": { "query": "Reginald Kenneth Dwight", "fields": [ "first", "middle", "last" ] "type": "cross_fields" }
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Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written permission is strictly prohibited.
"multi_match": { "query": "Reginald Kenneth Dwight", "fields": [ "first", "middle", "last" ] "type": "cross_fields", "minimum_should_match": "75%" }
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Copyright Elasticsearch 2014. Copying, publishing and/or distributing without written permission is strictly prohibited.
best_fields: whole concept in single field
most_fields: same text, different analyzers
cross_fields: treat multiple fields as one
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understand the building blocks
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the rest is details
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thank you@clintongormley
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