Docs

Author: Tim-Brooks

docs/reference/elasticsearch/configuration-reference/thread-pool-settings.md

@@ -33,7 +33,10 @@ $$$search-throttled$$$`search_throttled`
 :   For analyze requests. Thread pool type is `fixed` with a size of `1`, queue size of `16`.
 
 `write`
-:   For single-document index/delete/update, ingest processors, and bulk requests. Thread pool type is `fixed` with a size of [`# of allocated processors`](#node.processors), queue_size of `10000`. The maximum size for this pool is `1 + `[`# of allocated processors`](#node.processors).
+:   For write operations and ingest processors. Thread pool type is `fixed` with a size of [`# of allocated processors`](#node.processors), queue_size of `10000`. The maximum size for this pool is `1 + `[`# of allocated processors`](#node.processors).
+
+`write_coordination`
+:   For bulk request coordination operations. Thread pool type is `fixed` with a size of [`# of allocated processors`](#node.processors), queue_size of `10000`. The maximum size for this pool is `1 + `[`# of allocated processors`](#node.processors).
 
 `snapshot`
 :   For snapshot/restore operations. Thread pool type is `scaling` with a keep-alive of `5m`. On nodes with at least 750MB of heap the maximum size of this pool is `10` by default. On nodes with less than 750MB of heap the maximum size of this pool is `min(5, (`[`# of allocated processors`](#node.processors)`) / 2)` by default.