code: def get_filter_item(name: str, operation: bytes, value: bytes) -> bytes:
      
      assert isinstance(name, str)
      assert isinstance(value, bytes)
      if operation is None:
          return filter_format(b"(%s=%s)", [name, value])
      elif operation == "contains":
          assert value != ""
          return filter_format(b"(%s=*%s*)", [name, value])
      else:
          raise ValueError("Unknown search operation %s" % operation)
docs: A field could be found for this term, try to get filter string for it.