201 lines
5.4 KiB
Plaintext
201 lines
5.4 KiB
Plaintext
|
|
[[index-modules]]
|
|
= Index Modules
|
|
|
|
[partintro]
|
|
--
|
|
|
|
Index Modules are modules created per index and control all aspects related to
|
|
an index.
|
|
|
|
[float]
|
|
[[index-modules-settings]]
|
|
== Index Settings
|
|
|
|
Index level settings can be set per-index. Settings may be:
|
|
|
|
_static_::
|
|
|
|
They can only be set at index creation time or on a
|
|
<<indices-open-close,closed index>>.
|
|
|
|
_dynamic_::
|
|
|
|
They can be changed on a live index using the
|
|
<<indices-update-settings,update-index-settings>> API.
|
|
|
|
WARNING: Changing static or dynamic index settings on a closed index could
|
|
result in incorrect settings that are impossible to rectify without deleting
|
|
and recreating the index.
|
|
|
|
[float]
|
|
=== Static index settings
|
|
|
|
Below is a list of all _static_ index settings that are not associated with any
|
|
specific index module:
|
|
|
|
`index.number_of_shards`::
|
|
|
|
The number of primary shards that an index should have. Defaults to 5.
|
|
This setting can only be set at index creation time. It cannot be
|
|
changed on a closed index.
|
|
|
|
`index.shard.check_on_startup`::
|
|
+
|
|
--
|
|
experimental[] Whether or not shards should be checked for corruption before opening. When
|
|
corruption is detected, it will prevent the shard from being opened. Accepts:
|
|
|
|
`false`::
|
|
|
|
(default) Don't check for corruption when opening a shard.
|
|
|
|
`checksum`::
|
|
|
|
Check for physical corruption.
|
|
|
|
`true`::
|
|
|
|
Check for both physical and logical corruption. This is much more
|
|
expensive in terms of CPU and memory usage.
|
|
|
|
`fix`::
|
|
|
|
Check for both physical and logical corruption. Segments that were reported
|
|
as corrupted will be automatically removed. This option *may result in data loss*.
|
|
Use with extreme caution!
|
|
|
|
Checking shards may take a lot of time on large indices.
|
|
--
|
|
|
|
[[index-codec]] `index.codec`::
|
|
|
|
The +default+ value compresses stored data with LZ4
|
|
compression, but this can be set to +best_compression+
|
|
which uses https://en.wikipedia.org/wiki/DEFLATE[DEFLATE] for a higher
|
|
compression ratio, at the expense of slower stored fields performance.
|
|
|
|
[float]
|
|
[[dynamic-index-settings]]
|
|
=== Dynamic index settings
|
|
|
|
Below is a list of all _dynamic_ index settings that are not associated with any
|
|
specific index module:
|
|
|
|
|
|
`index.number_of_replicas`::
|
|
|
|
The number of replicas each primary shard has. Defaults to 1.
|
|
|
|
`index.auto_expand_replicas`::
|
|
|
|
Auto-expand the number of replicas based on the number of available nodes.
|
|
Set to a dash delimited lower and upper bound (e.g. `0-5`) or use `all`
|
|
for the upper bound (e.g. `0-all`). Defaults to `false` (i.e. disabled).
|
|
|
|
`index.refresh_interval`::
|
|
|
|
How often to perform a refresh operation, which makes recent changes to the
|
|
index visible to search. Defaults to `1s`. Can be set to `-1` to disable
|
|
refresh.
|
|
|
|
`index.max_result_window`::
|
|
|
|
The maximum value of `from + size` for searches to this index. Defaults to
|
|
`10000`. Search requests take heap memory and time proportional to
|
|
`from + size` and this limits that memory. See
|
|
<<search-request-scroll,Scroll>> or <<search-request-search-after,Search After>> for a more efficient alternative
|
|
to raising this.
|
|
|
|
`index.max_rescore_window`::
|
|
|
|
The maximum value of `window_size` for `rescore`s in searches of this index.
|
|
Defaults to `index.max_result_window` which defaults to `10000`. Search
|
|
requests take heap memory and time proportional to
|
|
`max(window_size, from + size)` and this limits that memory.
|
|
|
|
`index.blocks.read_only`::
|
|
|
|
Set to `true` to make the index and index metadata read only, `false` to
|
|
allow writes and metadata changes.
|
|
|
|
`index.blocks.read`::
|
|
|
|
Set to `true` to disable read operations against the index.
|
|
|
|
`index.blocks.write`::
|
|
|
|
Set to `true` to disable write operations against the index.
|
|
|
|
`index.blocks.metadata`::
|
|
|
|
Set to `true` to disable index metadata reads and writes.
|
|
|
|
`index.ttl.disable_purge`::
|
|
|
|
experimental[] Disables the purge of <<mapping-ttl-field,expired docs>> on
|
|
the current index.
|
|
|
|
`index.max_refresh_listeners`::
|
|
|
|
Maximum number of refresh listeners available on each shard of the index.
|
|
These listeners are used to implement <<docs-refresh,`refresh=wait_for`>>.
|
|
|
|
|
|
[float]
|
|
=== Settings in other index modules
|
|
|
|
Other index settings are available in index modules:
|
|
|
|
<<analysis,Analysis>>::
|
|
|
|
Settings to define analyzers, tokenizers, token filters and character
|
|
filters.
|
|
|
|
<<index-modules-allocation,Index shard allocation>>::
|
|
|
|
Control over where, when, and how shards are allocated to nodes.
|
|
|
|
<<index-modules-mapper,Mapping>>::
|
|
|
|
Enable or disable dynamic mapping for an index.
|
|
|
|
<<index-modules-merge,Merging>>::
|
|
|
|
Control over how shards are merged by the background merge process.
|
|
|
|
<<index-modules-similarity,Similarities>>::
|
|
|
|
Configure custom similarity settings to customize how search results are
|
|
scored.
|
|
|
|
<<index-modules-slowlog,Slowlog>>::
|
|
|
|
Control over how slow queries and fetch requests are logged.
|
|
|
|
<<index-modules-store,Store>>::
|
|
|
|
Configure the type of filesystem used to access shard data.
|
|
|
|
<<index-modules-translog,Translog>>::
|
|
|
|
Control over the transaction log and background flush operations.
|
|
|
|
--
|
|
|
|
include::index-modules/analysis.asciidoc[]
|
|
|
|
include::index-modules/allocation.asciidoc[]
|
|
|
|
include::index-modules/mapper.asciidoc[]
|
|
|
|
include::index-modules/merge.asciidoc[]
|
|
|
|
include::index-modules/similarity.asciidoc[]
|
|
|
|
include::index-modules/slowlog.asciidoc[]
|
|
|
|
include::index-modules/store.asciidoc[]
|
|
|
|
include::index-modules/translog.asciidoc[]
|