[DOCS] Relocate `indices` module content (#54903) (#57413)

Moves `indices` content from the [Modules][0] section to the [Configuring
Elasticsearch][1] section.

Also removes the [Indices][2] landing page and adds a related redirect.

[0]: https://www.elastic.co/guide/en/elasticsearch/reference/master/modules.html
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/master/settings.html
[2]: https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-indices.html

docs/reference/modules.asciidoc

@@ -79,8 +79,6 @@ include::modules/gateway.asciidoc[]
 
 include::modules/http.asciidoc[]
 
-include::modules/indices.asciidoc[]
-
 include::modules/network.asciidoc[]
 
 include::modules/node.asciidoc[]

docs/reference/modules/indices.asciidoc

@@ -1,50 +0,0 @@
-[[modules-indices]]
-== Indices
-
-The indices module controls index-related settings that are globally managed
-for all indices, rather than being configurable at a per-index level.
-
-Available settings include:
-
-<<circuit-breaker,Circuit breaker>>::
-
-    Circuit breakers set limits on memory usage to avoid out of memory exceptions.
-
-<<modules-fielddata,Fielddata cache>>::
-
-    Set limits on the amount of heap used by the in-memory fielddata cache.
-
-<<query-cache,Node query cache>>::
-
-    Configure the amount of heap used to cache queries results.
-
-<<indexing-buffer,Indexing buffer>>::
-
-    Control the size of the buffer allocated to the indexing process.
-
-<<shard-request-cache,Shard request cache>>::
-
-    Control the behaviour of the shard-level request cache.
-
-<<recovery,Recovery>>::
-
-    Control the resource limits on the shard recovery process.
-
-<<search-settings,Search Settings>>::
-
-    Control global search settings.
-
-include::indices/circuit_breaker.asciidoc[]
-
-include::indices/fielddata.asciidoc[]
-
-include::indices/query_cache.asciidoc[]
-
-include::indices/indexing_buffer.asciidoc[]
-
-include::indices/request_cache.asciidoc[]
-
-include::indices/recovery.asciidoc[]
-
-include::indices/search-settings.asciidoc[]
-

docs/reference/modules/indices/circuit_breaker.asciidoc

@@ -1,5 +1,5 @@
 [[circuit-breaker]]
-=== Circuit Breaker
+=== Circuit breaker settings
 
 Elasticsearch contains multiple circuit breakers used to prevent operations from
 causing an OutOfMemoryError. Each breaker specifies a limit for how much memory

docs/reference/modules/indices/fielddata.asciidoc

@@ -1,5 +1,5 @@
 [[modules-fielddata]]
-=== Fielddata
+=== Field data cache settings
 
 The field data cache is used mainly when sorting on or computing aggregations
 on a field. It loads all the field values to memory in order to provide fast

docs/reference/modules/indices/indexing_buffer.asciidoc

@@ -1,5 +1,5 @@
 [[indexing-buffer]]
-=== 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

docs/reference/modules/indices/query_cache.asciidoc

@@ -1,5 +1,5 @@
 [[query-cache]]
-=== Node Query Cache
+=== Node query cache settings
 
 The results of queries used in the filter context are cached in the node query 
 cache for fast lookup. There is one queries cache per node that is shared by all 

docs/reference/modules/indices/recovery.asciidoc

@@ -1,5 +1,5 @@
 [[recovery]]
-=== Index recovery
+=== Index recovery settings
 
 Peer recovery syncs data from a primary shard to a new or existing shard copy.
 

docs/reference/modules/indices/request_cache.asciidoc

@@ -1,5 +1,5 @@
 [[shard-request-cache]]
-=== Shard request cache
+=== Shard request cache settings
 
 When a search request is run against an index or against many indices, each
 involved shard executes the search locally and returns its local results to

docs/reference/modules/indices/search-settings.asciidoc

@@ -1,5 +1,5 @@
 [[search-settings]]
-=== Search Settings
+=== Search settings
 
 The following expert settings can be set to manage global search and aggregation
 limits.

docs/reference/redirects.asciidoc

@@ -615,6 +615,19 @@ See <<ccs-gateway-seed-nodes>> and <<ccs-min-roundtrips>>.
 See <<indices-create-data-stream>>, <<indices-get-data-stream>>, and
 <<indices-delete-data-stream>>.
 
+[role="exclude",id="modules-indices"]
+=== Indices module
+
+See:
+
+* <<circuit-breaker>>
+* <<indexing-buffer>>
+* <<modules-fielddata>>
+* <<query-cache>>
+* <<recovery>>
+* <<search-settings>>
+* <<shard-request-cache>>
+
 [role="exclude",id="cat-transform"]
 === cat transform API
 
@@ -799,4 +812,4 @@ See <<query-filter-context>>.
 We have stopped adding new customers to our {esms}.
 
 If you are interested in similar capabilities, contact
-https://support.elastic.co[Elastic Support] to discuss available options.
+https://support.elastic.co[Elastic Support] to discuss available options.

docs/reference/setup.asciidoc

@@ -45,22 +45,36 @@ include::setup/jvm-options.asciidoc[]
 
 include::setup/secure-settings.asciidoc[]
 
-include::setup/logging-config.asciidoc[]
-
-include::settings/audit-settings.asciidoc[]
-
 include::settings/ccr-settings.asciidoc[]
 
+include::modules/indices/circuit_breaker.asciidoc[]
+
+include::modules/indices/recovery.asciidoc[]
+
+include::modules/indices/indexing_buffer.asciidoc[]
+
+include::modules/indices/fielddata.asciidoc[]
+
 include::settings/ilm-settings.asciidoc[]
 
 include::settings/license-settings.asciidoc[]
 
+include::setup/logging-config.asciidoc[]
+
 include::settings/ml-settings.asciidoc[]
 
 include::settings/monitoring-settings.asciidoc[]
 
+include::modules/indices/query_cache.asciidoc[]
+
+include::modules/indices/request_cache.asciidoc[]
+
+include::modules/indices/search-settings.asciidoc[]
+
 include::settings/security-settings.asciidoc[]
 
+include::settings/audit-settings.asciidoc[]
+
 include::settings/slm-settings.asciidoc[]
 
 include::settings/sql-settings.asciidoc[]
@@ -81,4 +95,4 @@ include::setup/stopping.asciidoc[]
 
 include::setup/add-nodes.asciidoc[]
 
-include::setup/restart-cluster.asciidoc[]
+include::setup/restart-cluster.asciidoc[]