[[indices-flush]]
== Flush

The flush API allows to flush one or more indices through an API. The
flush process of an index basically frees memory from the index by
flushing data to the index storage and clearing the internal
<<index-modules-translog,transaction log>>. By
default, ElasticSearch uses memory heuristics in order to automatically
trigger flush operations as required in order to clear memory.

[source,js]
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$ curl -XPOST 'http://localhost:9200/twitter/_flush'
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[float]
=== Multi Index

The flush API can be applied to more than one index with a single call,
or even on `_all` the indices.

[source,js]
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$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_flush'

$ curl -XPOST 'http://localhost:9200/_flush'
--------------------------------------------------