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The indexing buffer is used to store newly indexed documents. When it fills up, the documents in the buffer are written to a segment on disk. It is divided between all shards on the node.
The following settings are static and must be configured on every data node in the cluster:
Accepts either a percentage or a byte size value. It defaults to
10%, meaning that
10%of the total heap allocated to a node will be used as the indexing buffer size shared across all shards.
index_buffer_sizeis specified as a percentage, then this setting can be used to specify an absolute minimum. Defaults to
index_buffer_sizeis specified as a percentage, then this setting can be used to specify an absolute maximum. Defaults to unbounded.