[API] Adds option to ignore 404 to delete_index_template and exists_index_template

Closes #1076

Author: picandocodigo

elasticsearch-api/lib/elasticsearch/api/actions/indices/delete_index_template.rb

@@ -42,7 +42,11 @@ def delete_index_template(arguments = {})
           params = Utils.__validate_and_extract_params arguments, ParamsRegistry.get(__method__)
 
           body = nil
-          perform_request(method, path, params, body, headers).body
+          if Array(arguments[:ignore]).include?(404)
+            Utils.__rescue_from_not_found { perform_request(method, path, params, body, headers).body }
+          else
+            perform_request(method, path, params, body, headers).body
+          end
         end
 
         # Register this action with its valid params when the module is loaded.

elasticsearch-api/lib/elasticsearch/api/actions/indices/exists_index_template.rb

@@ -43,7 +43,11 @@ def exists_index_template(arguments = {})
           params = Utils.__validate_and_extract_params arguments, ParamsRegistry.get(__method__)
 
           body = nil
-          perform_request(method, path, params, body, headers).body
+          if Array(arguments[:ignore]).include?(404)
+            Utils.__rescue_from_not_found { perform_request(method, path, params, body, headers).body }
+          else
+            perform_request(method, path, params, body, headers).body
+          end
         end
 
         alias_method :exists_index_template?, :exists_index_template

elasticsearch-api/utils/thor/generator/endpoint_specifics.rb

@@ -37,8 +37,10 @@ module EndpointSpecifics
         delete
         get
         indices.flush_synced
-        indices.delete_template
         indices.delete
+        indices.delete_index_template
+        indices.exists_index_template
+        indices.delete_template
         security.get_role
         security.get_user
         snapshot.status