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[[modules-indices]]
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== Indices
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The indices module allow to control settings that are globally managed
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for all indices.
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[float]
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[[buffer]]
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=== Indexing Buffer
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The indexing buffer setting allows to control how much memory will be
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allocated for the indexing process. It is a global setting that bubbles
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down to all the different shards allocated on a specific node.
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The `indices.memory.index_buffer_size` accepts either a percentage or a
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byte size value. It defaults to `10%`, meaning that `10%` of the total
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memory allocated to a node will be used as the indexing buffer size.
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This amount is then divided between all the different shards. Also, if
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percentage is used, it is possible to set `min_index_buffer_size` (defaults to
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`48mb`) and `max_index_buffer_size` (defaults to unbounded).
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The `indices.memory.min_shard_index_buffer_size` allows to set a hard
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lower limit for the memory allocated per shard for its own indexing
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buffer. It defaults to `4mb`.
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[float]
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[[indices-ttl]]
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=== TTL interval
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You can dynamically set the `indices.ttl.interval`, which allows to set how
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often expired documents will be automatically deleted. The default value
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is 60s.
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The deletion orders are processed by bulk. You can set
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`indices.ttl.bulk_size` to fit your needs. The default value is 10000.
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See also <<mapping-ttl-field>>.
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[float]
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[[recovery]]
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=== Recovery
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The following settings can be set to manage the recovery policy:
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[horizontal]
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`indices.recovery.concurrent_streams`::
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defaults to `3`.
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`indices.recovery.concurrent_small_file_streams`::
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defaults to `2`.
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`indices.recovery.file_chunk_size`::
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defaults to `512kb`.
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`indices.recovery.translog_ops`::
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defaults to `1000`.
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`indices.recovery.translog_size`::
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defaults to `512kb`.
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`indices.recovery.compress`::
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defaults to `true`.
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`indices.recovery.max_bytes_per_sec`::
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defaults to `40mb`.
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