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By default span_multi query will limit term expansions = boolean max clause. This will limit high heap usage in case of high cardinality term expansions. This applies only if top_terms_N is not used in inner multi query.
46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
[[query-dsl-span-multi-term-query]]
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=== Span Multi Term Query
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The `span_multi` query allows you to wrap a `multi term query` (one of wildcard,
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fuzzy, prefix, range or regexp query) as a `span query`, so
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it can be nested. Example:
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[source,js]
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--------------------------------------------------
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GET /_search
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{
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"query": {
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"span_multi":{
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"match":{
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"prefix" : { "user" : { "value" : "ki" } }
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}
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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A boost can also be associated with the query:
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[source,js]
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--------------------------------------------------
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GET /_search
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{
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"query": {
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"span_multi":{
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"match":{
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"prefix" : { "user" : { "value" : "ki", "boost" : 1.08 } }
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}
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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WARNING: `span_multi` queries will hit too many clauses failure if the number of terms that match the query exceeds the
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boolean query limit (defaults to 1024).To avoid an unbounded expansion you can set the <<query-dsl-multi-term-rewrite,
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rewrite method>> of the multi term query to `top_terms_*` rewrite. Or, if you use `span_multi` on `prefix` query only,
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you can activate the <<index-prefix-config,`index_prefixes`>> field option of the `text` field instead. This will
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rewrite any prefix query on the field to a a single term query that matches the indexed prefix.
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