Why Buckets Error

Trying to create too many buckets. Must be less than or equal to: [200000] but was [216793]. This limit can be set by changing the [search.max_buckets] cluster level setting.

There are two types of date fields in the ES data source fields, one is “timestamp_tr_comp”: // Timestamp of the completion of only the transfer part ,One is “tr_timestamp_complete”: // Timestamp of the whole copy process completion, Why the error occurs when selecting timestamp_tr_comp in groupbydatehistogram in the panel: Trying to create too many buckets. Must be less than or equal to: [200000] but was [216793]. This limit can be set by changing the [search.max_buckets] cluster level setting.But tr_timestamp_complete will not fail,Why?