Move analysis/mappings stats to cluster-stats. (#51260)

Closes #51138

docs/reference/cluster/stats.asciidoc

@@ -438,6 +438,19 @@ The API returns the following response:
          "fixed_bit_set_memory_in_bytes": 0,
          "max_unsafe_auto_id_timestamp" : -9223372036854775808,
          "file_sizes": {}
+      },
+      "mappings": {
+        "field_types": []
+      },
+      "analysis": {
+        "char_filter_types": [],
+        "tokenizer_types": [],
+        "filter_types": [],
+        "analyzer_types": [],
+        "built_in_char_filters": [],
+        "built_in_tokenizers": [],
+        "built_in_filters": [],
+        "built_in_analyzers": []
       }
    },
    "nodes": {
@@ -554,6 +567,7 @@ The API returns the following response:
 // TESTRESPONSE[s/"processor_stats": \{[^\}]*\}/"processor_stats": $body.$_path/]
 // TESTRESPONSE[s/"count": \{[^\}]*\}/"count": $body.$_path/]
 // TESTRESPONSE[s/"packaging_types": \[[^\]]*\]/"packaging_types": $body.$_path/]
+// TESTRESPONSE[s/"field_types": \[[^\]]*\]/"field_types": $body.$_path/]
 // TESTRESPONSE[s/: true|false/: $body.$_path/]
 // TESTRESPONSE[s/: (\-)?[0-9]+/: $body.$_path/]
 // TESTRESPONSE[s/: "[^"]*"/: $body.$_path/]

modules/analysis-common/src/test/resources/rest-api-spec/test/cluster.stats/10_analysis_stats.yml

@@ -0,0 +1,122 @@
+---
+"get cluster stats returns analysis stats":
+
+  - skip:
+      version: " - 7.99.99" # TODO: 7.6.99
+      reason:  "analysis stats are added for v7.7.0"
+
+  - do:
+      cluster.stats: {}
+
+  - length: { indices.analysis.char_filter_types: 0 }
+  - length: { indices.analysis.tokenizer_types: 0 }
+  - length: { indices.analysis.filter_types: 0 }
+  - length: { indices.analysis.analyzer_types: 0 }
+
+  - length: { indices.analysis.built_in_char_filters: 0 }
+  - length: { indices.analysis.built_in_tokenizers: 0 }
+  - length: { indices.analysis.built_in_filters: 0 }
+  - length: { indices.analysis.built_in_analyzers: 0 }
+
+  - do:
+      indices.create:
+        index: test-index1
+        body:
+          settings:
+            analysis:
+              char_filter:
+                c:
+                  type: mapping
+                  mappings: [ "a => b" ]
+              tokenizer:
+                tok:
+                  type: pattern
+                  pattern: ","
+              filter:
+                st:
+                  type: stop
+                  stopwords: [ "a" ]
+                st2:
+                  type: stop
+                  stopwords: [ "b" ]
+              analyzer:
+                en:
+                  type: standard
+                  stopwords: "_english_"
+                cust:
+                  char_filter: [ "html_strip" ]
+                  tokenizer: "keyword"
+                  filter: [ "trim" ]
+          mappings:
+            properties:
+              message:
+                type: "text"
+                analyzer: french
+                search_analyzer: spanish
+                search_quote_analyzer: german
+              description:
+                type: "text"
+                analyzer: french
+
+  - do:
+      indices.create:
+        index: test-index2
+        body:
+          mappings:
+            properties:
+              message:
+                type: "text"
+                analyzer: spanish
+
+  - do:
+      cluster.stats: {}
+
+  - length: { indices.analysis.char_filter_types: 1 }
+  - match: { indices.analysis.char_filter_types.0.name: mapping }
+  - match: { indices.analysis.char_filter_types.0.count: 1 }
+  - match: { indices.analysis.char_filter_types.0.index_count: 1 }
+
+  - length: { indices.analysis.tokenizer_types: 1 }
+  - match: { indices.analysis.tokenizer_types.0.name: pattern }
+  - match: { indices.analysis.tokenizer_types.0.count: 1 }
+  - match: { indices.analysis.tokenizer_types.0.index_count: 1 }
+
+  - length: { indices.analysis.filter_types: 1 }
+  - match: { indices.analysis.filter_types.0.name: stop }
+  - match: { indices.analysis.filter_types.0.count: 2 }
+  - match: { indices.analysis.filter_types.0.index_count: 1 }
+
+  - length: { indices.analysis.analyzer_types: 2 }
+  - match: { indices.analysis.analyzer_types.0.name: custom }
+  - match: { indices.analysis.analyzer_types.0.count: 1 }
+  - match: { indices.analysis.analyzer_types.0.index_count: 1 }
+  - match: { indices.analysis.analyzer_types.1.name: standard }
+  - match: { indices.analysis.analyzer_types.1.count: 1 }
+  - match: { indices.analysis.analyzer_types.1.index_count: 1 }
+
+  - length: { indices.analysis.built_in_char_filters: 1 }
+  - match: { indices.analysis.built_in_char_filters.0.name: html_strip }
+  - match: { indices.analysis.built_in_char_filters.0.count: 1 }
+  - match: { indices.analysis.built_in_char_filters.0.index_count: 1 }
+
+  - length: { indices.analysis.built_in_tokenizers: 1 }
+  - match: { indices.analysis.built_in_tokenizers.0.name: keyword }
+  - match: { indices.analysis.built_in_tokenizers.0.count: 1 }
+  - match: { indices.analysis.built_in_tokenizers.0.index_count: 1 }
+
+  - length: { indices.analysis.built_in_filters: 1 }
+  - match: { indices.analysis.built_in_filters.0.name: trim }
+  - match: { indices.analysis.built_in_filters.0.count: 1 }
+  - match: { indices.analysis.built_in_filters.0.index_count: 1 }
+
+  - length: { indices.analysis.built_in_analyzers: 3 }
+  - match: { indices.analysis.built_in_analyzers.0.name: french }
+  - match: { indices.analysis.built_in_analyzers.0.count: 2 }
+  - match: { indices.analysis.built_in_analyzers.0.index_count: 1 }
+  - match: { indices.analysis.built_in_analyzers.1.name: german }
+  - match: { indices.analysis.built_in_analyzers.1.count: 1 }
+  - match: { indices.analysis.built_in_analyzers.1.index_count: 1 }
+  - match: { indices.analysis.built_in_analyzers.2.name: spanish }
+  - match: { indices.analysis.built_in_analyzers.2.count: 2 }
+  - match: { indices.analysis.built_in_analyzers.2.index_count: 2 }
+

rest-api-spec/src/main/resources/rest-api-spec/test/cluster.stats/10_basic.yml

@@ -83,3 +83,57 @@
       cluster.stats: {}
 
   - is_true: nodes.packaging_types
+
+---
+"get cluster stats returns mapping stats":
+
+  - skip:
+      version: " - 7.99.99" # TODO: 7.6.99
+      reason:  "mapping stats are added for v7.7.0"
+
+  - do:
+      cluster.stats: {}
+
+  - length: { indices.mappings.field_types: 0 }
+
+  - do:
+      indices.create:
+        index: test-index1
+        body:
+          mappings:
+            properties:
+              foo:
+                type: keyword
+
+  - do:
+      indices.create:
+        index: test-index2
+        body:
+          mappings:
+            properties:
+              foo:
+                type: keyword
+              bar:
+                properties:
+                  quux:
+                    type: integer
+                  baz:
+                    type: keyword
+
+  - do:
+      cluster.stats: {}
+
+  - length: { indices.mappings.field_types: 3 }
+
+  - match: { indices.mappings.field_types.0.name: integer }
+  - match: { indices.mappings.field_types.0.count: 1 }
+  - match: { indices.mappings.field_types.0.index_count: 1 }
+
+  - match: { indices.mappings.field_types.1.name: keyword }
+  - match: { indices.mappings.field_types.1.count: 3 }
+  - match: { indices.mappings.field_types.1.index_count: 2 }
+
+  - match: { indices.mappings.field_types.2.name: object }
+  - match: { indices.mappings.field_types.2.count: 1 }
+  - match: { indices.mappings.field_types.2.index_count: 1 }
+