[role="xpack"]
[testenv="basic"]
[[indices-reload-analyzers]]
== Reload search analyzers API

Reloads an index's <<search-analyzer,search analyzers>> and their resources.
For data streams, the API reloads search analyzers and resources for the
stream's backing indices.

[source,console]
--------------------------------------------------
POST /my-index-000001/_reload_search_analyzers
POST /my-index-000001/_cache/clear?request=true
--------------------------------------------------
// TEST[setup:my_index]

IMPORTANT: After reloading the search analyzers you should clear the request
           cache to make sure it doesn't contain responses derived from the
           previous versions of the analyzer.
// the need for this is tracked in https://github.com/elastic/elasticsearch/issues/66722



[discrete]
[[indices-reload-analyzers-api-request]]
=== {api-request-title}

`POST /<target>/_reload_search_analyzers`

`GET /<target>/_reload_search_analyzers`

[discrete]
[[indices-reload-analyzers-api-prereqs]]
=== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have the `manage`
<<privileges-list-indices,index privilege>> for the target data stream, index,
or alias.

[discrete]
[[indices-reload-analyzers-api-desc]]
=== {api-description-title}

You can use the reload search analyzers API
to pick up changes to synonym files
used in the <<analysis-synonym-graph-tokenfilter,`synonym_graph`>>
or <<analysis-synonym-tokenfilter,`synonym`>> token filter
of a <<search-analyzer,search analyzer>>.
To be eligible,
the token filter must have an `updateable` flag of `true`
and only be used in search analyzers.

[NOTE]
====
This API does not perform a reload
for each shard of an index.
Instead,
it performs a reload for each node
containing index shards.
As a result,
the total shard count returned by the API
can differ from the number of index shards.

Because reloading affects every node with an index shard,
its important to update the synonym file
on every data node in the cluster,
including nodes that don't contain a shard replica,
before using this API.
This ensures the synonym file is updated
everywhere in the cluster
in case shards are relocated
in the future.
====


[discrete]
[[indices-reload-analyzers-api-path-params]]
=== {api-path-parms-title}

`<target>`::
(Required, string) Comma-separated list of data streams, indices, and aliases
used to limit the request. Supports wildcards (`*`). To target all data streams
and indices, use `*` or `_all`.

[discrete]
[[indices-reload-analyzers-api-query-params]]
=== {api-query-parms-title}

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=allow-no-indices]
+
Defaults to `true`.

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
+
Defaults to `open`.

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=index-ignore-unavailable]


[discrete]
[[indices-reload-analyzers-api-example]]
=== {api-examples-title}

Use the <<indices-create-index, create index API>>
to create an index with a search analyzer
that contains an updateable synonym filter.

NOTE: Using the following analyzer as an index analyzer results in an error.

[source,console]
--------------------------------------------------
PUT /my-index-000001
{
  "settings": {
    "index": {
      "analysis": {
        "analyzer": {
          "my_synonyms": {
            "tokenizer": "whitespace",
            "filter": [ "synonym" ]
          }
        },
        "filter": {
          "synonym": {
            "type": "synonym_graph",
            "synonyms_path": "analysis/synonym.txt",  <1>
            "updateable": true                        <2>
          }
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "text": {
        "type": "text",
        "analyzer": "standard",
        "search_analyzer": "my_synonyms"              <3>
      }
    }
  }
}
--------------------------------------------------

<1> Includes a synonym file.
<2> Marks the token filter as updateable.
<3> Marks the analyzer as a search analyzer.

After updating the synonym file,
use the <<indices-reload-analyzers,analyzer reload API>>
to reload the search analyzer
and pick up the file changes.

[source,console]
--------------------------------------------------
POST /my-index-000001/_reload_search_analyzers
--------------------------------------------------
// TEST[continued]

The API returns the following response.

[source,console-result]
--------------------------------------------------
{
  "_shards": {
    "total": 2,
    "successful": 2,
    "failed": 0
  },
  "reload_details": [
    {
      "index": "my-index-000001",
      "reloaded_analyzers": [
        "my_synonyms"
      ],
      "reloaded_node_ids": [
        "mfdqTXn_T7SGr2Ho2KT8uw"
      ]
    }
  ]
}
--------------------------------------------------
// TEST[continued]
// TESTRESPONSE[s/"total": 2/"total": $body._shards.total/]
// TESTRESPONSE[s/"successful": 2/"successful": $body._shards.successful/]
// TESTRESPONSE[s/mfdqTXn_T7SGr2Ho2KT8uw/$body.reload_details.0.reloaded_node_ids.0/]
