James Rodewig 43376c6e06 [DOCS] Document how CCS handles cluster-level settings (#49941)
Updates the cross-cluster search (CCS) documentation to note how
cluster-level settings are applied.

When `ccs_minimize_roundtrips` is `true`, each cluster applies its own
cluster-level settings to the request.

When `ccs_minimize_roundtrips` is `false`, cluster-level settings for
the local cluster is used. This includes shard limit settings, such as
`action.search.shard_count.limit`, `pre_filter_shard_size`, and
`max_concurrent_shard_requests`. If these limits are set too low, the
request could be rejected.
2020-02-19 09:21:57 -05:00
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