"mappings_path": "${fess.dictionary.path}mapping.txt"
        },
        "traditional_chinese_convert": {
          "type": "fess_traditional_chinese_convert",
          "convert_type": "t2s"
        },
        "zero_width_spaces": {
            "type":       "mapping",
            "mappings": [ "\\u200C=> "]
        },
        "removeall_filter": {
          "type": "pattern_replace",
          "pattern":"(.*)",