KeyError raised when modify index

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Description

      File "/usr/lib/python3.14/site-packages/docutils/parsers/rst/states.py", line 2286, in run_directive
        result = directive_instance.run()
      File "/usr/lib/python3.14/site-packages/sphinx/directives/other.py", line 80, in run
        self.parse_content(subnode)
        ~~~~~~~~~~~~~~~~~~^^^^^^^^^
      File "/usr/lib/python3.14/site-packages/sphinx/directives/other.py", line 98, in parse_content
        all_docnames.remove(current_docname)  # remove current document
        ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
    KeyError: 'notes/books/index'

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