OpenSearch/docs/reference/indices/apis/freeze.asciidoc

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[role="xpack"]
[testenv="basic"]
[[freeze-index-api]]
=== Freeze index API
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<titleabbrev>Freeze index</titleabbrev>
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Freezes an index.
[[freeze-index-api-request]]
==== {api-request-title}
`POST /<index>/_freeze`
//[[freeze-index-api-prereqs]]
//==== {api-prereq-title}
[[freeze-index-api-desc]]
==== {api-description-title}
A frozen index has almost no overhead on the cluster (except for maintaining its
metadata in memory) and is read-only. Read-only indices are blocked for write
operations, such as <<indexing,docs-index_>> or <<indices-forcemerge,force
merges>>. See <<frozen-indices>> and <<unfreeze-index-api>>.
IMPORTANT: Freezing an index will close the index and reopen it within the same
API call. This causes primaries to not be allocated for a short amount of time
and causes the cluster to go red until the primaries are allocated again. This
limitation might be removed in the future.
[[freeze-index-api-path-parms]]
==== {api-path-parms-title}
`<index>`::
(Required, string) Identifier for the index.
[[freeze-index-api-examples]]
==== {api-examples-title}
The following example freezes and unfreezes an index:
[source,console]
--------------------------------------------------
POST /my_index/_freeze
POST /my_index/_unfreeze
--------------------------------------------------
// TEST[s/^/PUT my_index\n/]