In our ES cluster, we have time based indexes from a few GB up to 100+GB (replicas not counted). The cluster uses hot cold model, and I'm looking at force merge (https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-forcemerge.html) to see if I could optimize the indexes on cold nodes for searching.
I haven't found any guidelines on setting the
max_num_segments for force merge. For instance, we have weekly indexes at about 120GB each with 4 primary shards, how to deternmine the proper
max_num_segments when running force merge on those indexes?