Performance Tuning

• Start with configuration of the cluster and its nodes: data, master, and client nodes

• Guesstimate usage pattern: lots of searches, vs. lots of indexing, vs. lots of aggregation

• OS Configuration: number of open file descriptors shall be set to at least 32K-64K

• OS Configuration: disable memory swapping (not always possible in virtual environment)

• Mapping and data-modeling selection: _all, _source, multi-fields

• Search vs. Filter - do you need to compute score based on the 'status:active' in your query?

• Use _bulk Api for indexing whenever possible

• Number of replicas and number of shards - reliability and scaling-out