[receiver/elasticsearch]: emit new indexing operations metrics on index level

[aboguszewski-sumo]

Description:
Emitting of the following metrics has been added:

elasticsearch_indices_stats_primaries_indexing_index_time_in_millis
elasticsearch_indices_stats_total_indexing_delete_total
elasticsearch_indices_stats_total_indexing_index_time_in_millis
elasticsearch_indices_stats_total_indexing_index_total

All necessary components were already present in the receiver, the metrics only needed to be emitted.

Link to tracking Issue: #14635

Testing:
Unit and integration tests.

Documentation:
mdatagen

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[aboguszewski-sumo]

Closing this for now, this PR is going to be replaced by another one, see #14924 (comment) for more info.