环境：ElasticSearch7.6.2
报这个错误 先看看索引字段 的mapping，然后查看 ElasticSearch 后台运行日志。
如果报这个错误
bug Trying to create too many buckets. Must be less than or equal to: [10000] but was [10001]. This limit can be set by changing the [search.max_buckets] cluster level setting.
这是6.x版本才有的特性，目的：限制大批量聚合操作，规避性能风险。
解决方案：setting里设置：search.max_buckets
curl方式 ：
curl --user 用户名:密码 -XPUT 'http://192.168.0.7:9200/_cluster/settings' -H 'Content-Type: application/json' -d'{"persistent": { "search.max_buckets": 217483647}}'