[DOCS] Replaces CCR terms with attributes (#39516)

docs/reference/ccr/apis/ccr-apis.asciidoc

@@ -1,7 +1,7 @@
 [role="xpack"]
 [testenv="platinum"]
 [[ccr-apis]]
-== Cross-cluster replication APIs
+== {ccr-cap} APIs
 
 You can use the following APIs to perform {ccr} operations.
 

docs/reference/ccr/apis/get-ccr-stats.asciidoc

@@ -1,7 +1,7 @@
 [role="xpack"]
 [testenv="platinum"]
 [[ccr-get-stats]]
-=== Get cross-cluster replication stats API
+=== Get {ccr} stats API
 ++++
 <titleabbrev>Get CCR stats</titleabbrev>
 ++++

docs/reference/ccr/index.asciidoc

@@ -1,7 +1,7 @@
 [role="xpack"]
 [testenv="platinum"]
 [[xpack-ccr]]
-= Cross-cluster replication
+= {ccr-cap}
 
 [partintro]
 --

docs/reference/ccr/overview.asciidoc

@@ -3,7 +3,8 @@
 [[ccr-overview]]
 == Overview
 
-Cross-cluster replication is done on an index-by-index basis. Replication is
+
+{ccr-cap} is done on an index-by-index basis. Replication is
 configured at the index level. For each configured replication there is a
 replication source index called the _leader index_ and a replication target
 index called the _follower index_.

docs/reference/ccr/requirements.asciidoc

@@ -3,7 +3,7 @@
 [[ccr-requirements]]
 === Requirements for leader indices
 
-Cross-cluster replication works by replaying the history of individual write
+{ccr-cap} works by replaying the history of individual write
 operations that were performed on the shards of the leader index. This means that the
 history of these operations needs to be retained on the leader shards so that
 they can be pulled by the follower shard tasks. The underlying mechanism used to

docs/reference/glossary.asciidoc

@@ -27,6 +27,12 @@
   chosen automatically by the cluster and which can be replaced if the
   current master node fails.
   
+[[glossary-ccr]] {ccr} (CCR)::
+
+  The {ccr} feature enables you to replicate indices in remote clusters to your
+  local cluster. For more information, see 
+  {stack-ov}/xpack-ccr.html[{ccr-cap}].  
+
 [[glossary-document]] document ::
 
   A document is a JSON document which is stored in Elasticsearch. It is
@@ -42,12 +48,6 @@
   <<glossary-source_field,`_source` field>>, which is returned by default when
   getting or searching for a document.
 
-[[glossary-id]] id ::
-
-  The ID of a <<glossary-document,document>> identifies a document. The
-  `index/id` of a document must be unique. If no ID is provided,
-  then it will be auto-generated. (also see <<glossary-routing,routing>>)
-
 [[glossary-field]] field ::
 
   A <<glossary-document,document>> contains a list of fields, or key-value
@@ -70,6 +70,17 @@
   hence it is called a filter. Filters are simple checks for set inclusion or exclusion. 
   In most cases, the goal of filtering is to reduce the number of documents that have to be examined.
   
+[[glossary-follower-index]] follower index ::  
+  
+  Follower indices are the target indices for <<glossary-ccr,{ccr}>>. They exist
+  in your local cluster and replicate <<glossary-leader-index,leader indices>>.
+  
+[[glossary-id]] id ::
+
+  The ID of a <<glossary-document,document>> identifies a document. The
+  `index/id` of a document must be unique. If no ID is provided,
+  then it will be auto-generated. (also see <<glossary-routing,routing>>)  
+
 [[glossary-index]] index ::
 
   An index is like a _table_ in a relational database. It has a
@@ -80,6 +91,12 @@
   <<glossary-primary-shard,primary shards>> and can have zero or more
   <<glossary-replica-shard,replica shards>>.
   
+[[glossary-leader-index]] leader index ::  
+    
+  Leader indices are the source indices for <<glossary-ccr,{ccr}>>. They exist
+  on remote clusters and are replicated to 
+  <<glossary-follower-index,follower indices>>.
+
 [[glossary-mapping]] mapping ::
 
   A mapping is like a _schema definition_ in a relational database. Each

docs/reference/modules/remote-clusters.asciidoc

@@ -9,7 +9,7 @@ endif::[]
 ifdef::include-xpack[]
 The _remote clusters_ module enables you to establish uni-directional
 connections to a remote cluster. This functionality is used in
-{stack-ov}/xpack-ccr.html[cross-cluster replication] and
+{stack-ov}/xpack-ccr.html[{ccr}] and
 <<modules-cross-cluster-search,cross-cluster search>>.
 endif::[]
 

docs/reference/rest-api/index.asciidoc

@@ -8,7 +8,7 @@
 directly to configure and access {xpack} features.
 
 * <<info-api,Info API>>
-* <<ccr-apis,Cross-cluster replication APIs>>
+* <<ccr-apis,{ccr-cap} APIs>>
 * <<graph-explore-api,Graph Explore API>>
 * <<freeze-index-api>>, <<unfreeze-index-api>>
 * <<index-lifecycle-management-api,Index lifecycle management APIs>>