As a follow up of this PR which adds a check if any indexed doc have an _ignored field. This could indicate a probable mapping problem

The following observability integration tests are failing with affected fields:

• spring_boot: host.ip
• oracle: oracle.database_audit.action
• mysql: mysql.slowlog.query
• activemq: error.stack_trace

Steps to reproduce the Issue

• run the system tests without tearing them down
• Look for _ignored field in the document. Check for ignored_field_values to see which field is causing issue.
• Fix potential issues with the fields affected or ignore the issues in case it is a false positive.