class_docstr: Japanese search implementation: uses no stemmer, but word splitting is quite
  complicated.
class_docstr_tok: ["Japanese","search","implementation",":","uses","no","stemmer",",","but","word","splitting","is","quite","complicated","."]
code: def stem(self, word: str) -> str:
      return word
  
imports: from __future__ import annotations
  import os
  import re
  import sys
  from typing import TYPE_CHECKING, Any, Dict, List
  from sphinx.errors import ExtensionError, SphinxError
  from sphinx.search import SearchLanguage
  from sphinx.util import import_object
label_desc: Use image node_id 4 for calling the SearchJapanese obj's underlying member method code with example usage: obj.stem(word) and returns: word