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These are modules created for each index to control the settings and behavior of the index. For example, how many shards the index can use or the number of replicas the primary shard of the index can have, etc. There are two types of index settings-
Static−These can only be set when creating the index or when the index is closed.
Dynamic −These can be changed on real-time indexes.
The table below shows the list of static index settings-
| Set | Possible values | Description |
|---|---|---|
| index.number_of_shards | The default value is5, the maximum value is1024 | The number of primary shards the index should have. |
| index.shard.check_on_startup | Default is false. Can be set to True | Whether it should check if the fragment is damaged before opening. |
| index.codec | LZ4Compression. | The compression type used to store data. |
| index.routing_partition_size | 1 | The number of fragments that the custom routing value can be redirected to. |
| index.load_fixed_bitset_filters_eagerly | false | Indicates whether to preload cache filters for nested queries |
The table below shows the list of dynamic index settings-
| Set | Possible values | Description |
|---|---|---|
| index.number_of_replicas | Default is1 | The number of replicas each primary shard has. |
| index.auto_expand_replicas | By the lower and upper limits (0-5Dash separated by parentheses | Automatically expand the number of replicas based on the number of data nodes in the cluster. |
| index.search.idle.after | 30seconds | The time that the shard cannot receive search or fetch requests before it is considered as search idle. |
| index.refresh_interval | 1 second | Frequency of executing refresh operations, refresh operations make recent changes to the index visible for search. |