问题：

下面这个报错，是在配置同义词的时候报的错：不能识别南京。

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "failed to build synonyms"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "failed to build synonyms",
    "caused_by": {
      "type": "parse_exception",
      "reason": "Invalid synonym rule at line 1",
      "caused_by": {
        "type": "illegal_argument_exception",
        "reason": "term: 南京 was completely eliminated by analyzer"
      }
    }
  },
  "status": 400
}

解决方式：

这是因为我在停止词里面配置“南京”这个词导致的。删除停止词库中的“南京”或者去除对应的同义词皆可。