[8.0] Skip '$body' key when fetching response attributes

Author: V1NAY8

dev-requirements.txt

@@ -15,6 +15,7 @@ isort
 black
 twine
 build
+nox
 
 # No wheels for Python 3.10 yet!
 numpy; python_version<"3.10"

test_elasticsearch/test_server/test_rest_api_spec.py

@@ -467,9 +467,11 @@ def _lookup(self, path):
         for step in path.split("."):
             if not step:
                 continue
+            # We check body again to handle E.g. '$body.$backing_index.data_stream'
+            if step.startswith("$body"):
+                continue
             step = step.replace("\1", ".")
             step = self._resolve(step)
-
             if (
                 isinstance(step, string_types)
                 and step.isdigit()