Validate deprecation warnings after checking number of docs ingested #2377
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Follows #2369
Check deprecation warnings after being validated that there are at least one document in the index/data stream (so it is created).
Errors in CI daily jobs when there are no documents (index/data stream is not created): https://buildkite.com/elastic/integrations/builds/21038#0194aa90-57eb-41b1-83ee-387c64d0ba92/641-3441
Buildkite applying this change (errors is reported as "not found hits"):
https://buildkite.com/elastic/integrations/builds/21071