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Flush Cache The flush process frees memory from the index by flushing data to the index storage and clearing the internal transaction log. By default, ElasticSearch uses memory heuristics in order to automatically trigger flush operations as required in order to clear memory.
Clear Cache Clears the field data cache, filter cache, and parent/child cache.
Force Merge Index The force merge process optimizes the index for faster search operations (and relates to the number of segments a lucene index holds within each shard). This operation reduces the number of segments by merging them. Should not be done on a cluster with active/live writes!
Refresh Index Makes all operations performed since the last refresh available for search. The (near) real-time capabilities depend on the index engine used. By default refreshes are scheduled periodically within Elasticsearch.
Expunge Deleted Attempts to clear deleted documents from disk during the merge process.
Close Index Blocks read/write operations on this index. Closing an index can reduce overhead on the cluster.