Add a note about zstd incompatibility with k-NN and security analytics (

#5014) * Add a note about zstd incompatibility with k-NN and security analytics plugins Signed-off-by: Fanit Kolchina <[email protected]> * Capitalization Signed-off-by: Fanit Kolchina <[email protected]> * Update _im-plugin/index-codecs.md Signed-off-by: kolchfa-aws <[email protected]> * Update _im-plugin/index-codecs.md Co-authored-by: Nathan Bower <[email protected]> Signed-off-by: kolchfa-aws <[email protected]> --------- Signed-off-by: Fanit Kolchina <[email protected]> Signed-off-by: kolchfa-aws <[email protected]> Co-authored-by: Nathan Bower <[email protected]>
opensearch-project · Sep 22, 2023 · bf886cb · bf886cb
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diff --git a/_im-plugin/index-codecs.md b/_im-plugin/index-codecs.md
@@ -24,6 +24,9 @@ It may be challenging to change the codec setting of an existing index (see [Cha
 * `zstd` (OpenSearch 2.9 and later) -- This codec provides significant compression comparable to the `best_compression` codec with reasonable CPU usage and improved indexing and search performance compared to the `default` codec.
 * `zstd_no_dict` (OpenSearch 2.9 and later) -- This codec is similar to `zstd` but excludes the dictionary compression feature. It provides faster indexing and search operations compared to `zstd` at the expense of a slightly larger index size.
 
+As of OpenSearch 2.10, the `zstd` and `zstd_no_dict` compression codecs cannot be used for [k-NN]({{site.url}}{{site.baseurl}}/search-plugins/knn/index/) or [Security Analytics]({{site.url}}{{site.baseurl}}/security-analytics/index/) indexes.
+{: .warning}
+
 For the `zstd` and `zstd_no_dict` codecs, you can optionally specify a compression level in the `index.codec.compression_level` setting. This setting takes integers in the [1, 6] range. A higher compression level results in a higher compression ratio (smaller storage size) with a tradeoff in speed (slower compression and decompression speeds lead to greater indexing and search latencies). 
 
 When an index segment is created, it uses the current index codec for compression. If you update the index codec, any segment created after the update will use the new compression algorithm. For specific operation considerations, see [Index codec considerations for index operations](#index-codec-considerations-for-index-operations).