318 lines
10 KiB
Plaintext
318 lines
10 KiB
Plaintext
[[query-dsl-query-string-query]]
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=== Query String Query
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A query that uses a query parser in order to parse its content. Here is
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an 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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"query_string" : {
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"default_field" : "content",
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"query" : "this AND that OR thus"
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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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The `query_string` query parses the input and splits text around operators.
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Each textual part is analyzed independently of each other. For instance the following 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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"query_string" : {
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"default_field" : "content",
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"query" : "(new york city) OR (big apple)"
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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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... will be split into `new york city` and `big apple` and each part is then
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analyzed independently by the analyzer configured for the field.
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WARNING: Whitespaces are not considered operators, this means that `new york city`
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will be passed "as is" to the analyzer configured for the field. If the field is a `keyword`
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field the analyzer will create a single term `new york city` and the query builder will
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use this term in the query. If you want to query each term separately you need to add explicit
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operators around the terms (e.g. `new AND york AND city`).
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When multiple fields are provided it is also possible to modify how the different
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field queries are combined inside each textual part using the `type` parameter.
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The possible modes are described <<multi-match-types, here>> and the default is `best_fields`.
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The `query_string` top level parameters include:
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[cols="<,<",options="header",]
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|=======================================================================
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|Parameter |Description
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|`query` |The actual query to be parsed. See <<query-string-syntax>>.
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|`default_field` |The default field for query terms if no prefix field is
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specified. Defaults to the `index.query.default_field` index settings, which in
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turn defaults to `*`. `*` extracts all fields in the mapping that are eligible
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to term queries and filters the metadata fields. All extracted fields are then
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combined to build a query when no prefix field is provided.
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WARNING: There is a limit on the number of fields that can be queried
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at once. It is defined by the `indices.query.bool.max_clause_count` <<search-settings>>
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which defaults to 1024.
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|`default_operator` |The default operator used if no explicit operator
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is specified. For example, with a default operator of `OR`, the query
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`capital of Hungary` is translated to `capital OR of OR Hungary`, and
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with default operator of `AND`, the same query is translated to
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`capital AND of AND Hungary`. The default value is `OR`.
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|`analyzer` |The analyzer name used to analyze the query string.
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|`quote_analyzer` |The name of the analyzer that is used to analyze
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quoted phrases in the query string. For those parts, it overrides other
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analyzers that are set using the `analyzer` parameter or the
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<<search-quote-analyzer,`search_quote_analyzer`>> setting.
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|`allow_leading_wildcard` |When set, `*` or `?` are allowed as the first
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character. Defaults to `true`.
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|`enable_position_increments` |Set to `true` to enable position
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increments in result queries. Defaults to `true`.
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|`fuzzy_max_expansions` |Controls the number of terms fuzzy queries will
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expand to. Defaults to `50`
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|`fuzziness` |Set the fuzziness for fuzzy queries. Defaults
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to `AUTO`. See <<fuzziness>> for allowed settings.
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|`fuzzy_prefix_length` |Set the prefix length for fuzzy queries. Default
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is `0`.
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|`fuzzy_transpositions` |Set to `false` to disable fuzzy transpositions (`ab` -> `ba`).
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Default is `true`.
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|`phrase_slop` |Sets the default slop for phrases. If zero, then exact
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phrase matches are required. Default value is `0`.
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|`boost` |Sets the boost value of the query. Defaults to `1.0`.
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|`analyze_wildcard` |By default, wildcards terms in a query string are
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not analyzed. By setting this value to `true`, a best effort will be
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made to analyze those as well.
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|`max_determinized_states` |Limit on how many automaton states regexp
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queries are allowed to create. This protects against too-difficult
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(e.g. exponentially hard) regexps. Defaults to 10000.
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|`minimum_should_match` |A value controlling how many "should" clauses
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in the resulting boolean query should match. It can be an absolute value
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(`2`), a percentage (`30%`) or a
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<<query-dsl-minimum-should-match,combination of
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both>>.
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|`lenient` |If set to `true` will cause format based failures (like
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providing text to a numeric field) to be ignored.
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|`time_zone` | Time Zone to be applied to any range query related to dates. See also
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http://www.joda.org/joda-time/apidocs/org/joda/time/DateTimeZone.html[JODA timezone].
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|`quote_field_suffix` | A suffix to append to fields for quoted parts of
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the query string. This allows to use a field that has a different analysis chain
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for exact matching. Look <<mixing-exact-search-with-stemming,here>> for a
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comprehensive example.
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|`auto_generate_synonyms_phrase_query` |Whether phrase queries should be automatically generated for multi terms synonyms.
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Defaults to `true`.
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|=======================================================================
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When a multi term query is being generated, one can control how it gets
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rewritten using the
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<<query-dsl-multi-term-rewrite,rewrite>>
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parameter.
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[float]
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==== Default Field
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When not explicitly specifying the field to search on in the query
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string syntax, the `index.query.default_field` will be used to derive
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which field to search on. If the `index.query.default_field` is not specified,
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the `query_string` will automatically attempt to determine the existing fields in the index's
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mapping that are queryable, and perform the search on those fields. Note that this will not
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include nested documents, use a nested query to search those documents.
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[float]
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==== Multi Field
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The `query_string` query can also run against multiple fields. Fields can be
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provided via the `"fields"` parameter (example below).
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The idea of running the `query_string` query against multiple fields is to
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expand each query term to an OR clause like this:
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field1:query_term OR field2:query_term | ...
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For example, the following 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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"query_string" : {
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"fields" : ["content", "name"],
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"query" : "this AND that"
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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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matches the same words as
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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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"query_string": {
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"query": "(content:this OR name:this) AND (content:that OR name:that)"
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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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Since several queries are generated from the individual search terms,
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combining them is automatically done using a `dis_max` query with a tie_breaker.
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For example (the `name` is boosted by 5 using `^5` notation):
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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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"query_string" : {
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"fields" : ["content", "name^5"],
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"query" : "this AND that OR thus",
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"tie_breaker" : 0
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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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Simple wildcard can also be used to search "within" specific inner
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elements of the document. For example, if we have a `city` object with
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several fields (or inner object with fields) in it, we can automatically
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search on all "city" fields:
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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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"query_string" : {
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"fields" : ["city.*"],
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"query" : "this AND that OR thus"
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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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Another option is to provide the wildcard fields search in the query
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string itself (properly escaping the `*` sign), for example:
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`city.\*:something`:
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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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"query_string" : {
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"query" : "city.\\*:(this AND that OR thus)"
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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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NOTE: Since `\` (backslash) is a special character in json strings, it needs to
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be escaped, hence the two backslashes in the above `query_string`.
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When running the `query_string` query against multiple fields, the
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following additional parameters are allowed:
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[cols="<,<",options="header",]
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|=======================================================================
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|Parameter |Description
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|`type` |How the fields should be combined to build the text query.
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See <<multi-match-types, types>> for a complete example.
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Defaults to `best_fields`
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|`tie_breaker` |The disjunction max tie breaker for multi fields.
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Defaults to `0`
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|=======================================================================
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The fields parameter can also include pattern based field names,
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allowing to automatically expand to the relevant fields (dynamically
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introduced fields included). For 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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"query_string" : {
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"fields" : ["content", "name.*^5"],
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"query" : "this AND that OR thus"
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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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[float]
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==== Synonyms
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The `query_string` query supports multi-terms synonym expansion with the <<analysis-synonym-graph-tokenfilter,
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synonym_graph>> token filter. When this filter is used, the parser creates a phrase query for each multi-terms synonyms.
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For example, the following synonym: `"ny, new york" would produce:`
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`(ny OR ("new york"))`
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It is also possible to match multi terms synonyms with conjunctions instead:
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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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"query_string" : {
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"default_field": "title",
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"query" : "ny city",
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"auto_generate_synonyms_phrase_query" : false
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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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The example above creates a boolean query:
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`(ny OR (new AND york)) city`
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that matches documents with the term `ny` or the conjunction `new AND york`.
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By default the parameter `auto_generate_synonyms_phrase_query` is set to `true`.
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include::query-string-syntax.asciidoc[]
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