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[[modules-indices]]
== Indices
The indices module allow to control settings that are globally managed
for all indices.
[float]
[[buffer]]
=== Indexing Buffer
The indexing buffer setting allows to control how much memory will be
allocated for the indexing process. It is a global setting that bubbles
down to all the different shards allocated on a specific node.
The `indices.memory.index_buffer_size` accepts either a percentage or a
byte size value. It defaults to `10%`, meaning that `10%` of the total
memory allocated to a node will be used as the indexing buffer size.
This amount is then divided between all the different shards. Also, if
percentage is used, allow to set `min_index_buffer_size` (defaults to
`48mb`) and `max_index_buffer_size` which by default is unbounded.
The `indices.memory.min_shard_index_buffer_size` allows to set a hard
lower limit for the memory allocated per shard for its own indexing
buffer. It defaults to `4mb`.
[float]
[[indices-ttl]]
=== TTL interval
You can dynamically set the `indices.ttl.interval` allows to set how
often expired documents will be automatically deleted. The default value
is 60s.
The deletion orders are processed by bulk. You can set
`indices.ttl.bulk_size` to fit your needs. The default value is 10000.
See also <<mapping-ttl-field>>.
[float]
[[recovery]]
=== Recovery
The following settings can be set to manage recovery policy:
[horizontal]
`indices.recovery.concurrent_streams`::
defaults to `3`.
`indices.recovery.file_chunk_size`::
defaults to `512kb`.
`indices.recovery.translog_ops`::
defaults to `1000`.
`indices.recovery.translog_size`::
defaults to `512kb`.
`indices.recovery.compress`::
defaults to `true`.
`indices.recovery.max_bytes_per_sec`::
defaults to `20mb`.
[float]
[[throttling]]
=== Store level throttling
The following settings can be set to control store throttling:
[horizontal]
`indices.store.throttle.type`::
could be `merge` (default), `not` or `all`. See <<index-modules-store>>.
`indices.store.throttle.max_bytes_per_sec`::
defaults to `20mb`.
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