Not sure if this really belongs in Elasticsearch, or in Logstash, but since I'm using both, I'll put it in Elasticsearch.
I recently noticed our ELK cluster has thousands and thousands of fields named "column" followed by a number. I have no idea how they got there, but I want to get rid of them. I understand my only option may be a full reindex (pain) but if I'm wrong, please let me know? Also, does anyone know how these fields could've appeared in the first place?
We're feeding the cluster with Filebeats via Logstash and with data coming in via the Logstash syslog plugin.