Index settings
Index level settings can be set per-index. Settings may be:
- Static
They can only be set at index creation time or on a closed index, or by using the update index settings API with the
reopenquery parameter set totrue(which automatically closes and reopens impacted indices). - Dynamic They can be changed on a live index using the update index settings API.
Warning
You can change any documented index settings on closed indices. However, changing undocumented index settings on closed indices is unsupported and might result in errors.
Settings are available for the following modules:
- History retention Control the retention of a history of operations in the index.
- Index General settings that affect the behavior of indices.
- Index shard allocation Control where, when, and how shards are allocated to nodes.
- Indexing pressure Configure indexing back pressure limits.
- Merge Control how shards are merged by the background merge process.
- Similarities Configure custom similarity settings to customize how search results are scored.
- Slowlog Control how slow queries and fetch requests are logged.
- Store Configure the type of filesystem used to access shard data.
- Time series Configure the backing indices in a time series data stream (TSDS).
- Translog Control the transaction log and background flush operations.