Internal:  adjusted visibility to package private for BroadcastShardOperationRequest subclasses and their constructors

Also replaced the String,int pair for index and shard_id with ShardId object that holds the same info and serialized it the same way too.

Closes #7235
Remove `numeric_range` filter

As done with #4034, `numeric_range` filter has been deprecated since 1.0.0.

Closes #7108.
[DOCS] mention the type of caches that warmers load
Fix: VerboseProgress(PrintWriter) does not set the writer
Tests: move plugin dir to plugins dir

We should be consistent in our naming for classes and resources.
Update api & Indices stats: fixed version checks for no-op updates which got in after 1.3 was released

Also added basic bw comp test for indices stats api.

Relates to #6822
A content decompressor that throws a human readable message when
compression is disabled and the user sends compressed content.
Add GroovyCollections to the sandbox whitelist

Also clarify in the docs that changing the whitelist/blacklist settings
replace the list, they don't add to it.

Fixes #7089
Fixes #7088