I migrated to a 7.4 cluster from a stand alone 5.x single test instance. I may have carried over some legacy bad habits so to speak. Attempting to implement ILM policies but exposing other issues.
I followed the same older example of shipping via filebeat to logstash and creating indices based on an index pattern. I never created any "index template" for these various indices and never really understood why it was required in the newer examples of shippers. I see mappings and shard settings so something is taking care of it.
Can I simply create a NEW index template for these pre-existing indices based on the index pattern so I can apply ILM policies to it? Will this cause an issue to the existing "rules" that are currently being applied to the filebeat indices based on index pattern?