[8.x] Remove empty results before merging (#126770) #127031
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We addressed the empty top docs issue with elastic#126385 specifically for scenarios where empty top docs don't go through the wire. Yet they may be serialized from data node back to the coord node, in which case they will no longer be equal to Lucene#EMPTY_TOP_DOCS. This commit expands the existing filtering of empty top docs to include also those that did go through serialization. Closes elastic#126742
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We addressed the empty top docs issue with #126385 specifically for scenarios where empty top docs don't go through the wire. Yet they may be serialized from data node back to the coord node, in which case they will no longer be equal to Lucene#EMPTY_TOP_DOCS.
This commit expands the existing filtering of empty top docs to include also those that did go through serialization.
8.x backport of #126770
Closes #126742