[[indexing-buffer]] === Indexing buffer settings 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: `indices.memory.index_buffer_size`:: (<>) 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. `indices.memory.min_index_buffer_size`:: (<>) If the `index_buffer_size` is specified as a percentage, then this setting can be used to specify an absolute minimum. Defaults to `48mb`. `indices.memory.max_index_buffer_size`:: (<>) If the `index_buffer_size` is specified as a percentage, then this setting can be used to specify an absolute maximum. Defaults to unbounded.