389 lines
11 KiB
Plaintext
389 lines
11 KiB
Plaintext
[[search-multi-search]]
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=== Multi Search API
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Executes several searches with a single API request.
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[source,console]
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--------------------------------------------------
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GET twitter/_msearch
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{ }
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{"query" : {"match" : { "message": "this is a test"}}}
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{"index": "twitter2"}
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{"query" : {"match_all" : {}}}
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--------------------------------------------------
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// TEST[setup:twitter]
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[[search-multi-search-api-request]]
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==== {api-request-title}
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`GET /<index>/_msearch`
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[[search-multi-search-api-desc]]
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==== {api-description-title}
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The multi search API executes several searches from a single API request.
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The format of the request is similar to the bulk API format and makes use
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of the newline delimited JSON (NDJSON) format.
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The structure is as follows:
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[source,js]
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--------------------------------------------------
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header\n
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body\n
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header\n
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body\n
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--------------------------------------------------
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// NOTCONSOLE
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This structure is specifically optimized to reduce parsing if a specific search
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ends up redirected to another node.
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[IMPORTANT]
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====
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The final line of data must end with a newline character `\n`. Each newline
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character may be preceded by a carriage return `\r`. When sending requests to
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this endpoint the `Content-Type` header should be set to `application/x-ndjson`.
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====
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[[search-multi-search-api-path-params]]
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==== {api-path-parms-title}
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include::{docdir}/rest-api/common-parms.asciidoc[tag=index]
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+
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To search all indices, use `_all` or omit this parameter.
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[[search-multi-search-api-query-params]]
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==== {api-query-parms-title}
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include::{docdir}/rest-api/common-parms.asciidoc[tag=allow-no-indices]
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`ccs_minimize_roundtrips`::
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(Optional, boolean)
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If `true`, network roundtrips between the coordinating node and remote clusters
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are minimized for {ccs} requests. Defaults to `true`. See
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<<ccs-network-delays>>.
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include::{docdir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
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+
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Defaults to `open`.
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`ignore_throttled`::
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(Optional, boolean)
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If `true`, concrete, expanded or aliased indices are ignored when throttled.
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Defaults to `false`.
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include::{docdir}/rest-api/common-parms.asciidoc[tag=index-ignore-unavailable]
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`max_concurrent_searches`::
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(Optional, integer)
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Maximum number of concurrent searches the multi search API can execute. Defaults
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to +max(1, (# of <<data-node,data nodes>> * min(<<search-threadpool,search thread pool size>>, 10)))+.
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`max_concurrent_shard_requests`::
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+
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--
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(Optional, integer)
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Maximum number of concurrent shard requests that each sub-search request
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executes per node. Defaults to `5`.
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You can use this parameter to prevent a request from overloading a cluster. For
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example, a default request hits all indices in a cluster. This could cause shard
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request rejections if the number of shards per node is high.
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In certain scenarios, parallelism isn't achieved through concurrent requests. In
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those cases, a low value in this parameter could result in poor performance.
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For example, in an environment where a very low number of concurrent search
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requests are expected, a higher value in this parameter may improve performance.
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--
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`pre_filter_shard_size`::
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(Optional, integer)
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Defines a threshold that enforces a pre-filter roundtrip to prefilter search
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shards based on query rewriting if the number of shards the search request
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expands to exceeds the threshold. This filter roundtrip can limit the number of
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shards significantly if for instance a shard can not match any documents based
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on its rewrite method i.e., if date filters are mandatory to match but the
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shard bounds and the query are disjoint.
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When unspecified, the pre-filter phase is executed if any of these
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conditions is met:
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- The request targets more than `128` shards.
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- The request targets one or more read-only index.
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- The primary sort of the query targets an indexed field.
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`rest_total_hits_as_int`::
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(Optional, boolean)
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If `true`, `hits.total` are returned as an integer in the
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response. Defaults to `false`, which returns an object.
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`routing`::
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(Optional, string)
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Custom <<mapping-routing-field,routing value>> used to route search operations
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to a specific shard.
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`search_type`::
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+
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--
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(Optional, string)
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Indicates whether global term and document frequencies should be used when
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scoring returned documents.
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Options are:
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`query_then_fetch`::
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(default)
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Documents are scored using local term and document frequencies for the shard.
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This is usually faster but less accurate.
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`dfs_query_then_fetch`::
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Documents are scored using global term and document frequencies across all
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shards. This is usually slower but more accurate.
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--
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`typed_keys`::
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(Optional, boolean)
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Specifies whether aggregation and suggester names should be prefixed by their
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respective types in the response.
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[[search-multi-search-api-request-body]]
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==== {api-request-body-title}
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The request body contains a newline-delimited list of search `<header>` and
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search `<body>` objects.
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`<header>`::
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+
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--
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(Required, object)
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Contains parameters used to limit or change the subsequent search body request.
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This object is required for each search body but can be empty (`{}`) or a blank
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line.
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--
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`allow_no_indices`:::
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(Optional, boolean)
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If `true`, the request does *not* return an error if a wildcard expression or
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`_all` value retrieves only missing or closed indices.
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+
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This parameter also applies to <<indices-aliases,index aliases>> that point to a
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missing or closed index.
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include::{docdir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
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+
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Defaults to `open`.
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`ignore_unavailable`:::
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(Optional, boolean) If `true`, documents from missing or closed indices are not
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included in the response. Defaults to `false`.
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`index`:::
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(Optional, string or array of strings)
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Index name or <<indices-aliases,alias>> used to limit the request. Wildcard
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expressions are supported. You can specify multiple indices as an array.
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`preference`:::
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(Optional, string)
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Node or shard used to perform the search. Random by default.
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`request_cache`:::
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(Optional, boolean)
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If `true`, the request cache can be used for this search. Defaults to
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index-level settings. See <<shard-request-cache>>.
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`routing`:::
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(Optional, string)
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Custom <<mapping-routing-field,routing value>> used to route search operations
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to a specific shard.
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`search_type`:::
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+
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--
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(Optional, string)
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Indicates whether global term and document frequencies should be used when
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scoring returned documents.
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Options are:
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`query_then_fetch`::
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(default)
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Documents are scored using local term and document frequencies for the shard.
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This is usually faster but less accurate.
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`dfs_query_then_fetch`::
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Documents are scored using global term and document frequencies across all
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shards. This is usually slower but more accurate.
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--
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`<body>`::
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(Optional, object)
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Contains parameters for a search request:
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`aggregations`:::
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(Optional, <<_structuring_aggregations,aggregation object>>)
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Aggregations you wish to run during the search. See <<search-aggregations>>.
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`query`:::
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(Optional, <<query-dsl,query DSL object>>) Query you wish to run during the
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search. Hits matching this query are returned in the response.
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`from`:::
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(Optional, integer)
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Starting offset for returned hits. Defaults to `0`.
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`size`:::
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(Optional, integer)
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Number of hits to return. Defaults to `10`.
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[[search-multi-search-api-response-body]]
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==== {api-response-body-title}
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`responses`::
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(array) Includes the search response and status code for each search request
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matching its order in the original multi search request. If there was a
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complete failure for a specific search request, an object with `error` message
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and corresponding status code will be returned in place of the actual search
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response.
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[[search-multi-search-api-example]]
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==== {api-examples-title}
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The header part includes which index / indices to search on, the `search_type`,
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`preference`, and `routing`. The body includes the typical search body request
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(including the `query`, `aggregations`, `from`, `size`, and so on).
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[source,js]
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--------------------------------------------------
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$ cat requests
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{"index" : "test"}
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{"query" : {"match_all" : {}}, "from" : 0, "size" : 10}
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{"index" : "test", "search_type" : "dfs_query_then_fetch"}
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{"query" : {"match_all" : {}}}
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{}
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{"query" : {"match_all" : {}}}
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{"query" : {"match_all" : {}}}
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{"search_type" : "dfs_query_then_fetch"}
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{"query" : {"match_all" : {}}}
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--------------------------------------------------
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// NOTCONSOLE
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[source,js]
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--------------------------------------------------
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$ curl -H "Content-Type: application/x-ndjson" -XGET localhost:9200/_msearch --data-binary "@requests"; echo
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--------------------------------------------------
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// NOTCONSOLE
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Note, the above includes an example of an empty header (can also be just
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without any content) which is supported as well.
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The endpoint allows to also search against an index/indices in the URI itself,
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in which case it will be used as the default unless explicitly defined otherwise
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in the header. For example:
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[source,console]
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--------------------------------------------------
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GET twitter/_msearch
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{}
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{"query" : {"match_all" : {}}, "from" : 0, "size" : 10}
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{}
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{"query" : {"match_all" : {}}}
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{"index" : "twitter2"}
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{"query" : {"match_all" : {}}}
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--------------------------------------------------
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// TEST[setup:twitter]
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The above will execute the search against the `twitter` index for all the
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requests that don't define an index, and the last one will be executed
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against the `twitter2` index.
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The `search_type` can be set in a similar manner to globally apply to
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all search requests.
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[[msearch-security]]
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==== Security
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See <<url-access-control>>
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[[template-msearch]]
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==== Template support
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Much like described in <<search-template>> for the _search resource, _msearch
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also provides support for templates. Submit them like follows for inline
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templates:
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[source,console]
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-----------------------------------------------
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GET _msearch/template
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{"index" : "twitter"}
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{ "source" : "{ \"query\": { \"match\": { \"message\" : \"{{keywords}}\" } } } }", "params": { "query_type": "match", "keywords": "some message" } }
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{"index" : "twitter"}
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{ "source" : "{ \"query\": { \"match_{{template}}\": {} } }", "params": { "template": "all" } }
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-----------------------------------------------
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// TEST[setup:twitter]
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You can also create search templates:
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[source,console]
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------------------------------------------
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POST /_scripts/my_template_1
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{
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"script": {
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"lang": "mustache",
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"source": {
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"query": {
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"match": {
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"message": "{{query_string}}"
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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[setup:twitter]
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[source,console]
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------------------------------------------
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POST /_scripts/my_template_2
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{
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"script": {
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"lang": "mustache",
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"source": {
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"query": {
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"term": {
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"{{field}}": "{{value}}"
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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[continued]
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You can use search templates in a _msearch:
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[source,console]
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-----------------------------------------------
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GET _msearch/template
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{"index" : "main"}
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{ "id": "my_template_1", "params": { "query_string": "some message" } }
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{"index" : "main"}
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{ "id": "my_template_2", "params": { "field": "user", "value": "test" } }
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-----------------------------------------------
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// TEST[continued]
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[[multi-search-partial-responses]]
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==== Partial responses
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To ensure fast responses, the multi search API will respond with partial results
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if one or more shards fail. See <<shard-failures, Shard failures>> for more
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information.
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