Generate initial NEST code for 7.10.1 (#5123)

Author: stevejgordon

src/ApiGenerator/RestSpecification/_Patches/indices.flush_synced.patch.json

@@ -0,0 +1,20 @@
+{
+  "indices.flush_synced": {
+    "url": {
+      "path": "/_flush/synced",
+      "paths": [ "/_flush/synced", "/{index}/_flush/synced" ],
+      "deprecated_paths": [
+        {
+          "version": "7.6.0",
+          "path": "/_flush/synced",
+          "description": "Synced flush is deprecated and will be removed in 8.0. Use flush instead."
+        },
+        {
+          "version": "7.6.0",
+          "path": "/{index}/_flush/synced",
+          "description": "Synced flush is deprecated and will be removed in 8.0. Use flush instead."
+        }
+      ]
+    }
+  }
+}