Attempt to stabilize DLQ Integration tests
- Only tear down ES instance once tests are complete
- Delete indices after each test
- Tear down Logstash after each test
Fixes#8143
Simple test for dead letter queue integration tests:
Attempt to write invalid entries to elastic search, fail and
remove invalid field. Verify that mutated entry exists in es
Not for committing - has different jvm.options to improve stability
to ensure that the tests pass in CI.
Fixes#7882Fixes#8026