When a commit is issued to a Solr core, it makes index changes visible to new search requests. Commits may come from an application or an auto-commit. A "normal" commit in DSE is usually more often than not from an auto commit in which is, as outlined here, configured in the solr config file.
Each time a commit is issued a new searcher object is created. When there are too many searcher objects this warning will be observed.
Also if the configuration is such that a searcher has pre-warming queries, this can delay the start time meaning that the searcher is still starting up when a new commit comes in.
Read full article from FAQ - Solr logging "PERFORMANCE WARNING: Overlapping onDeckSearchers" and its meaning – DataStax Support
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