问 弹性搜索5.3.2版本中的“未知BaseAggregationBuilder [significant_text]”

EN

为了实现文本字段的聚合，我尝试给出了

"aggs": {
    "keywords": {
      "significant_text": {
        "field": "testId",
        "min_doc_count":1
}

这在elk 6.6.1版本中运行良好。但在ELK 5.3.1版本中，它抛出一个错误

{
  "error": {
    "root_cause": [
        "type": "unknown_named_object_exception",
        "reason": "Unknown BaseAggregationBuilder [significant_text]",
        "line": 107,
        "col": 27
    "type": "unknown_named_object_exception",