part types are not string but list on the _search_shards endpoint

Author: Mpdreamz

rest-api-spec/src/main/resources/rest-api-spec/api/search_shards.json

@@ -7,14 +7,12 @@
       "paths": ["/_search_shards", "/{index}/_search_shards", "/{index}/{type}/_search_shards"],
       "parts": {
         "index": {
-          "type" : "string",
-          "required" : false,
-          "description" : "The name of the index"
+          "type" : "list",
+          "description" : "A comma-separated list of index names to search; use `_all` or empty string to perform the operation on all indices"
         },
         "type": {
-          "type" : "string",
-          "required" : false,
-          "description" : "The type of the document"
+          "type" : "list",
+          "description" : "A comma-separated list of document types to search; leave empty to perform the operation on all types"
         }
       },
       "params": {