Always use one shard in vector REST tests. #51643
Merged
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This PR tries to address the intermittent vector test failures on 7.x by making
sure we create indices with one shard.
The fix is based on this theory as to what's happening:
2 in order to cover the multiple shards case. In the failing test run, we use 2
shards and all documents end up on only one shard.
deprecation warnings because we never try to execute the script. If not all
shard responses contain the warning headers, then certain deprecation warnings
can be lost (due to the bug described in Response headers missing from search response #33936).
Addresses #50716.
Relates to #50061.