[DOCS] omission of core thread pools "management, flush, force_merge, fetch_shard_started and fetch_shard_store"

[dharada]

Describe the feature: This is not feature request. Just a document issue.

Elasticsearch version (bin/elasticsearch --version): latest

Plugins installed: []

JVM version (java -version): n/a

OS version (uname -a if on a Unix-like system): n/a

Description of the problem including expected versus actual behavior:

These core thread pools are undocumented as of now.

• management
• flush
• force_merge
• fetch_shard_started
• fetch_shard_store

please check here.
https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-threadpool.html

(ref)

elasticsearch/server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java

Line 65 in d579f89

public class ThreadPool implements Scheduler, Closeable {

[elasticmachine]

Pinging @elastic/es-docs (>docs)

[elasticmachine]

Pinging @elastic/es-core-infra (:Core/Infra/Core)

[jrodewig]

[docs issue triage]