ik热更新对旧数据reindex操作报错

采用ik热加载字典后，需要对旧数据经行reindex，我这里调用的是
POST index/_update_by_query
{
  "conflicts" :"proceed"
}
返回的是超时
{"statusCode":504,"error":"Gateway Time-out","message":"Client request timeout"}
 
若不用conflicts=proceed的话
{
  "took" : 31593,
  "timed_out" : false,
  "total" : 473783,
  "updated" : 32332,
  "deleted" : 0,
  "batches" : 33,
  "version_conflicts" : 668,
  "noops" : 0,
  "retries" : {
    "bulk" : 0,
    "search" : 0
  },
  "throttled_millis" : 0,
  "requests_per_second" : -1.0,
  "throttled_until_millis" : 0,
  "failures" : [
    {
      "index" : "index",
      "type" : "_doc",
      "id" : "2203092",
      "cause" : {
        "type" : "version_conflict_engine_exception",
        "reason" : "[2203092]: version conflict, required seqNo [3597589], primary term [4]. current document has seqNo [4071372] and primary term [4]",
        "index_uuid" : "3i2M-KPLTjWTUViXkwIsQA",
        "shard" : "0",
        "index" : "mali_prop"
      },
      "status" : 409
    }
 
failures全是同样的信息
 
不过经测试是能reindex 分词有效果
 
数据我是用canal同步mysql的 
 
请问我该如何reindex才行？