76 lines
2.1 KiB
Plaintext
76 lines
2.1 KiB
Plaintext
[[painless-min-should-match-context]]
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=== Minimum should match context
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Use a Painless script to specify the
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{ref}/query-dsl-terms-set-query.html[minimum] number of terms that a
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specified field needs to match with for a document to be part of the query
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results.
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*Variables*
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`params` (`Map`, read-only)::
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User-defined parameters passed in as part of the query.
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`params['num_terms']` (`int`, read-only)::
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The number of terms specified to match with.
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`doc` (`Map`, read-only)::
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Contains the fields of the current document where each field is a
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`List` of values.
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*Return*
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`int`::
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The minimum number of terms required to match the current document.
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*API*
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The standard <<painless-api-reference, Painless API>> is available.
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*Example*
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To run this example, first follow the steps in
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<<painless-context-examples, context examples>>.
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Imagine that you want to find seats to performances by your favorite
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actors. You have a list of favorite actors in mind, and you want
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to find performances where the cast includes at least a certain
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number of them. `terms_set` query with `minimum_should_match_script`
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is a way to accomplish this. To make the query request more configurable,
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you can define `min_actors_to_see` as a script parameter.
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To ensure that the parameter `min_actors_to_see` doesn't exceed
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the number of favorite actors, you can use `num_term`s to get
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the number of actors in the list and `Math.min` to get the lesser
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of the two.
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[source,Painless]
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----
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Math.min(params['num_terms'], params['min_actors_to_see'])
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----
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The following request finds seats to performances with at least
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two of the three specified actors.
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[source,console]
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----
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GET seats/_search
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{
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"query" : {
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"terms_set": {
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"actors" : {
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"terms" : ["smith", "earns", "black"],
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"minimum_should_match_script": {
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"source": "Math.min(params['num_terms'], params['min_actors_to_see'])",
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"params" : {
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"min_actors_to_see" : 2
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}
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}
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}
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}
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}
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}
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----
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// TEST[skip: requires setup from other pages]
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