code: def _process_elements(self, elements):
      def _process_elements_on_operation(op, items):
          for item in items:
              yield from op.process_element(item)
  
      for operation in self._chained_operations:
          elements = _process_elements_on_operation(operation, elements)
  
      return elements
  
file_path: flink/flink-python/pyflink/fn_execution/embedded/operations.py
imports: from pyflink.fn_execution.datastream.embedded.operations import extract_process_function
  from pyflink.fn_execution.embedded.converters import DataConverter
label_desc: Use image node_id 5 for calling the FunctionOperation obj's underlying member method code with example usage: obj._process_elements(elements) and returns: elements