[DOCS] Renamed the "cat" chapters to be more searchable

docs/reference/cat/alias.asciidoc

@@ -1,5 +1,5 @@
 [[cat-alias]]
-== Aliases
+== cat aliases
 
 `aliases` shows information about currently configured aliases to indices
 including filter and routing infos.

docs/reference/cat/allocation.asciidoc

@@ -1,5 +1,5 @@
 [[cat-allocation]]
-== Allocation
+== cat allocation
 
 `allocation` provides a snapshot of how shards have located around the
 cluster and the state of disk usage.

docs/reference/cat/count.asciidoc

@@ -1,5 +1,5 @@
 [[cat-count]]
-== Count
+== cat count
 
 `count` provides quick access to the document count of the entire
 cluster, or individual indices.

docs/reference/cat/fielddata.asciidoc

@@ -1,5 +1,5 @@
 [[cat-fielddata]]
-== Fielddata
+== cat fielddata
 
 `fielddata` shows information about currently loaded fielddata on a per-node
 basis.

docs/reference/cat/health.asciidoc

@@ -1,5 +1,5 @@
 [[cat-health]]
-== Health
+== cat health
 
 `health` is a terse, one-line representation of the same information
 from `/_cluster/health`. It has one option `ts` to disable the

docs/reference/cat/indices.asciidoc

@@ -1,5 +1,5 @@
 [[cat-indices]]
-== Indices
+== cat indices
 
 The `indices` command provides a cross-section of each index.  This
 information *spans nodes*.

docs/reference/cat/master.asciidoc

@@ -1,5 +1,5 @@
 [[cat-master]]
-== Master
+== cat master
 
 `master` doesn't have any extra options. It simply displays the
 master's node ID, bound IP address, and node name.

docs/reference/cat/nodes.asciidoc

@@ -1,5 +1,5 @@
 [[cat-nodes]]
-== Nodes
+== cat nodes
 
 The `nodes` command shows the cluster topology.
 

docs/reference/cat/pending_tasks.asciidoc

@@ -1,5 +1,5 @@
 [[cat-pending-tasks]]
-== Cluster Pending Tasks
+== cat pending tasks
 
 `pending_tasks` provides the same information as the
 <<cluster-pending,`/_cluster/pending_tasks`>> API in a

docs/reference/cat/plugins.asciidoc

@@ -1,5 +1,5 @@
 [[cat-plugins]]
-== Plugins
+== cat plugins
 
 The `plugins` command provides a view per node of running plugins. This information *spans nodes*.
 

docs/reference/cat/recovery.asciidoc

@@ -1,5 +1,5 @@
 [[cat-recovery]]
-== Recovery
+== cat recovery
 
 `recovery` is a view of shard replication.  It will show information
 anytime data from at least one shard is copying to a different node.

docs/reference/cat/shards.asciidoc

@@ -1,5 +1,5 @@
 [[cat-shards]]
-== Shards
+== cat shards
 
 The `shards` command is the detailed view of what nodes contain which
 shards.  It will tell you if it's a primary or replica, the number of

docs/reference/cat/thread_pool.asciidoc

@@ -1,5 +1,5 @@
 [[cat-thread-pool]]
-== Thread pool
+== cat thread pool
 
 The `thread_pool` command shows cluster wide thread pool statistics per node. By default the active, queue and rejected
 statistics are returned for the bulk, index and search thread pools.