I use filebeat, logstash, and elasticsearch to index log messages, kibana for visualization.
Within logstash I use grok to split the message into different fields, one of which is "logmessage". If "logmessage" is too long, it is not indexed in elasticsearch and the value for "logmessage" is missing in visualizations, but visible in Discover. I suspect the value of ignore_above of 256 being the culprit as the missing values for logmessage are strings longer than 256 characters.
Where do I configure easily and sustainably the value of ignore_above for "logmessage"?