Feature/7.6/code gen (#4386)

* make provisions for unions

(cherry picked from commit bdabdfc)

* Low level code gen for 7.6

* move to 7.6-SNAPSHOT on our 7.6 branch

* Apply suggestions from code review

* make sure we generate https:// even if the source says http://

Author: Mpdreamz

src/ApiGenerator/Domain/Specification/Documentation.cs

@@ -8,7 +8,13 @@ namespace ApiGenerator.Domain.Specification
 	public class Documentation
 	{
 		public string Description { get; set; }
-		public string Url { get; set; }
+
+		private string _url;
+		public string Url
+		{
+			get => _url;
+			set => _url = value?.Replace("http://", "https://");
+		}
 	}
 
 	public class DocumentationConverter : JsonConverter

src/ApiGenerator/Domain/Specification/QueryParameters.cs

@@ -12,6 +12,7 @@ public class QueryParameters
 			"fields", "_source_includes", "_source_excludes",
 		};
 
+
 		public bool Skip { get; set; }
 
 		public string ClsArgumentName => ClsName.ToCamelCase();
@@ -72,7 +73,15 @@ public IEnumerable<string> DescriptionHighLevel
 
 		public string SetterLowLevel => "value";
 
-		public string Type { get; set; }
+		private string _type;
+		public string Type
+		{
+			// TODO support unions
+			get => !_type.Contains("|")
+				? _type
+				: _type.Split('|', StringSplitOptions.RemoveEmptyEntries).First().Trim();
+			set => _type = value;
+		}
 
 		public string TypeHighLevel
 		{
@@ -127,7 +136,6 @@ public string TypeLowLevel
 			}
 		}
 
-
 		public string InitializerGenerator(string @namespace, string type, string name, string key, string setter, params string[] doc) =>
 			CodeGenerator.Property(@namespace, type, name, key, setter, Obsolete, doc);
 	}

src/ApiGenerator/RestSpecification/Core/delete_by_query.json

@@ -178,9 +178,9 @@
         "description": "The throttle for this request in sub-requests per second. -1 means no throttle."
       },
       "slices": {
-        "type": "number|string",
+        "type": "number",
         "default": 1,
-        "description": "The number of slices this task should be divided into. Defaults to 1, meaning the task isn't sliced into subtasks. Can be set to `auto`."
+        "description": "The number of slices this task should be divided into. Defaults to 1 meaning the task isn't sliced into subtasks."
       }
     },
     "body":{

src/ApiGenerator/RestSpecification/Core/root.html

@@ -1,8 +1,6 @@
 {
   "enrich.delete_policy": {
-    "documentation": {
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/delete-enrich-policy-api.html"
-    },
+    "documentation": "https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-delete-policy.html",
     "stability" : "stable",
     "url": {
       "paths": [

src/ApiGenerator/RestSpecification/XPack/enrich.delete_policy.json

@@ -1,8 +1,6 @@
 {
   "enrich.execute_policy": {
-    "documentation": {
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/execute-enrich-policy-api.html"
-    },
+    "documentation": "https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-execute-policy.html",
     "stability" : "stable",
     "url": {
       "paths": [

src/ApiGenerator/RestSpecification/XPack/enrich.execute_policy.json

@@ -1,8 +1,6 @@
 {
   "enrich.get_policy": {
-    "documentation": {
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/get-enrich-policy-api.html"
-    },
+    "documentation": "https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-get-policy.html",
     "stability" : "stable",
     "url": {
       "paths": [

src/ApiGenerator/RestSpecification/XPack/enrich.get_policy.json

@@ -1,8 +1,6 @@
 {
   "enrich.put_policy": {
-    "documentation": {
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/put-enrich-policy-api.html"
-    },
+    "documentation": "https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-put-policy.html",
     "stability" : "stable",
     "url": {
       "paths": [

src/ApiGenerator/RestSpecification/XPack/enrich.put_policy.json

@@ -1,8 +1,6 @@
 {
   "enrich.stats": {
-    "documentation": {
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-stats-api.html"
-    },
+    "documentation": "https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-stats.html",
     "stability" : "stable",
     "url": {
       "paths": [

src/ApiGenerator/RestSpecification/XPack/enrich.stats.json

@@ -1,7 +1,7 @@
 {
   "migration.deprecations":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/migration-api-deprecation.html"
+      "url":"http://www.elastic.co/guide/en/elasticsearch/reference/current/migration-api-deprecation.html"
     },
     "stability":"stable",
     "url":{