This change ensures that the rewrite of the shard request is executed in the network thread or in the refresh listener
when waiting for an active shard. This allows queries that rewrite to match_no_docs to bypass the search thread pool
entirely even if the can_match phase was skipped (pre_filter_shard_size > number of shards). Coordinating nodes
don't have the ability to create empty responses so this change also ensures that at least one shard creates a full empty
response while the other can return null ones. This is needed since creating true empty responses on shards require to create
concrete aggregators which would be too costly to build on a network thread. We should move this functionality to aggregation
builders in a follow up but that would be a much bigger change.
This change is also important for elastic#49601 since we want to add the ability to use the result of other shards to rewrite the request
of subsequent ones. For instance if the first M shards have their top N computed, the top worst document in the global queue can be pass
to subsequent shards that can then rewrite to match_no_docs if they can guarantee that they don't have any document better than the provided
one.