The number of shards (splits) of an index (2 by default) The 'number of shards' is a one-time setting for an index. Index need to be recreated if one wants to change this setting as elasticsearch indexes have an important limitation in that they cannot be 'resharded'

Default: 2

The number of replicas (additional copies) of an index (1 by default). Considering there are 2 shards for an index, each replica will be roughly half of the size of the index In one node environment, make the number of replicas to 0 to avoid unnecessary storage

Default: 1

The number of records to be retrieved in each iteration when scrolling the catalog of indexes

Default: 500