2013-08-28 19:24:34 -04:00
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[[index-modules]]
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= Index Modules
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[partintro]
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--
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Index Modules are modules created per index and control all aspects
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related to an index. Since those modules lifecycle are tied to an index,
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all the relevant modules settings can be provided when creating an index
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(and it is actually the recommended way to configure an index).
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[float]
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2013-09-30 17:32:00 -04:00
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[[index-modules-settings]]
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2013-08-28 19:24:34 -04:00
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== Index Settings
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There are specific index level settings that are not associated with any
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specific module. These include:
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`index.compound_format`::
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Should the compound file format be used (boolean
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setting). If not set, controlled by the actually store used, this is
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because the compound format was created to reduce the number of open
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file handles when using file based storage. By default, it is set to
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`false` for better performance (really applicable for file system based
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index storage), but, requires adapting the max open file handles.
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`index.term_index_interval`::
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Set the interval between indexed terms.
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Large values cause less memory to be used by a reader / searcher, but
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slow random-access to terms. Small values cause more memory to be used
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by a reader / searcher, and speed random-access to terms. Defaults to
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`128`.
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`index.term_index_divisor`::
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Subsamples which indexed terms are loaded
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into RAM. This has the same effect as `index.term_index_interval` except
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that setting must be done at indexing time while this setting can be set
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per reader / searcher. When set to N, then one in every
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N*termIndexInterval terms in the index is loaded into memory. By setting
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this to a value > 1 you can reduce memory usage, at the expense of
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higher latency when loading a TermInfo. The default value is 1. Set this
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to -1 to skip loading the terms index entirely.
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`index.refresh_interval`::
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A time setting controlling how often the
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refresh operation will be executed. Defaults to `1s`. Can be set to `-1`
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in order to disable it.
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--
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include::index-modules/analysis.asciidoc[]
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include::index-modules/allocation.asciidoc[]
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include::index-modules/slowlog.asciidoc[]
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include::index-modules/merge.asciidoc[]
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include::index-modules/store.asciidoc[]
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include::index-modules/mapper.asciidoc[]
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include::index-modules/translog.asciidoc[]
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include::index-modules/cache.asciidoc[]
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include::index-modules/fielddata.asciidoc[]
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include::index-modules/codec.asciidoc[]
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include::index-modules/similarity.asciidoc[]
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