[Backport 7.x] Update generated low-level client code (#5220)

* Exclude QueryWatches from API renaming
* Add cat tasks patch
* Low-level code gen

(cherry picked from commit b22f06d)

Author: stevejgordon

src/ApiGenerator/Domain/Code/CsharpNames.cs

@@ -37,7 +37,7 @@ string Replace(string original, string ns, string find, string replace, string[]
 
 			var namespaceRenames = new Dictionary<string, (string find, string replace, string[] exceptions)>
 			{
-				{ "Watcher", (find: "Watch", replace: "", exceptions: new string[0]) },
+				{ "Watcher", (find: "Watch", replace: "", exceptions: new string[]{ "QueryWatches" }) },
 				{ "Indices", (find: "Index", replace: "", exceptions: new [] { "SimulateIndexTemplate" }) },
 				{ "CrossClusterReplication", (find: "Ccr", replace: "", exceptions: new string[0]) },
 				{ "IndexLifecycleManagement", (find: "Ilm", replace: "", exceptions: new string[0]) },

src/ApiGenerator/RestSpecification/Core/bulk.json

@@ -5,6 +5,11 @@
       "description":"Allows to perform multiple index/update/delete operations in a single request."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"],
+      "content_type": ["application/x-ndjson"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.aliases.json

@@ -5,6 +5,10 @@
       "description":"Shows information about currently configured aliases to indices including filter and routing infos."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.allocation.json

@@ -5,6 +5,10 @@
       "description":"Provides a snapshot of how many shards are allocated to each data node and how much disk space they are using."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.count.json

@@ -5,6 +5,10 @@
       "description":"Provides quick access to the document count of the entire cluster, or individual indices."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.fielddata.json

@@ -5,6 +5,10 @@
       "description":"Shows how much heap memory is currently being used by fielddata on every data node in the cluster."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.health.json

@@ -5,6 +5,10 @@
       "description":"Returns a concise representation of the cluster health."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.help.json

@@ -5,6 +5,10 @@
       "description":"Returns help for the Cat APIs."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain" ]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.indices.json

@@ -5,6 +5,10 @@
       "description":"Returns information about indices: number of primaries and replicas, document counts, disk size, ..."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.master.json

@@ -5,6 +5,10 @@
       "description":"Returns information about the master node."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.nodeattrs.json

@@ -5,6 +5,10 @@
       "description":"Returns information about custom node attributes."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.nodes.json

@@ -5,6 +5,10 @@
       "description":"Returns basic statistics about performance of cluster nodes."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.pending_tasks.json

@@ -5,6 +5,10 @@
       "description":"Returns a concise representation of the cluster pending tasks."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.plugins.json

@@ -5,6 +5,10 @@
       "description":"Returns information about installed plugins across nodes node."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {
@@ -37,6 +41,11 @@
         "description":"Return help information",
         "default":false
       },
+      "include_bootstrap":{
+        "type":"boolean",
+        "description":"Include bootstrap plugins in the response",
+        "default":false
+      },
       "s":{
         "type":"list",
         "description":"Comma-separated list of column names or column aliases to sort by"

src/ApiGenerator/RestSpecification/Core/cat.recovery.json

@@ -5,6 +5,10 @@
       "description":"Returns information about index shard recoveries, both on-going completed."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.repositories.json

@@ -5,6 +5,10 @@
       "description":"Returns information about snapshot repositories registered in the cluster."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.segments.json

@@ -5,6 +5,10 @@
       "description":"Provides low-level information about the segments in the shards of an index."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.shards.json

@@ -5,6 +5,10 @@
       "description":"Provides a detailed view of shard allocation on nodes."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.snapshots.json

@@ -5,6 +5,10 @@
       "description":"Returns all snapshots in a specific repository."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.tasks.json

@@ -5,6 +5,10 @@
       "description":"Returns information about the tasks currently executing on one or more nodes in the cluster."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {
@@ -20,7 +24,7 @@
         "type":"string",
         "description":"a short version of the Accept header, e.g. json, yaml"
       },
-      "node_id":{
+      "nodes":{
         "type":"list",
         "description":"A comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes"
       },
@@ -32,9 +36,9 @@
         "type":"boolean",
         "description":"Return detailed task information (default: false)"
       },
-      "parent_task":{
-        "type":"number",
-        "description":"Return tasks with specified parent task id. Set to -1 to return all."
+      "parent_task_id":{
+        "type":"string",
+        "description":"Return tasks with specified parent task id (node_id:task_number). Set to -1 to return all."
       },
       "h":{
         "type":"list",

src/ApiGenerator/RestSpecification/Core/cat.templates.json

@@ -5,6 +5,10 @@
       "description":"Returns information about existing templates."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cat.thread_pool.json

@@ -5,6 +5,10 @@
       "description":"Returns cluster-wide thread pool statistics per node.\nBy default the active, queue and rejected statistics are returned for all thread pools."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "text/plain", "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/clear_scroll.json

@@ -5,6 +5,11 @@
       "description":"Explicitly clears the search context for a scroll."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"],
+      "content_type": ["application/json","text/plain"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.allocation_explain.json

@@ -5,6 +5,11 @@
       "description":"Provides explanations for shard allocations in the cluster."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"],
+      "content_type": ["application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.delete_component_template.json

@@ -5,6 +5,10 @@
       "description":"Deletes a component template"
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.delete_voting_config_exclusions.json

@@ -5,6 +5,10 @@
       "description":"Clears cluster voting config exclusions."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.exists_component_template.json

@@ -5,6 +5,10 @@
       "description":"Returns information about whether a particular component template exist"
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.get_component_template.json

@@ -5,6 +5,10 @@
       "description":"Returns one or more component templates"
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.get_settings.json

@@ -5,6 +5,10 @@
       "description":"Returns cluster settings."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.health.json

@@ -5,6 +5,10 @@
       "description":"Returns basic information about the health of the cluster."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.pending_tasks.json

@@ -5,6 +5,10 @@
       "description":"Returns a list of any cluster-level changes (e.g. create index, update mapping,\nallocate or fail shard) which have not yet been executed."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.post_voting_config_exclusions.json

@@ -5,6 +5,10 @@
       "description":"Updates the cluster voting config exclusions by node ids or node names."
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"]
+    },
     "url":{
       "paths":[
         {

src/ApiGenerator/RestSpecification/Core/cluster.put_component_template.json

@@ -5,6 +5,11 @@
       "description":"Creates or updates a component template"
     },
     "stability":"stable",
+    "visibility":"public",
+    "headers":{
+      "accept": [ "application/json"],
+      "content_type": ["application/json"]
+    },
     "url":{
       "paths":[
         {