How Do I Set search.max_buckets for an Elasticsearch Cluster of CSS?

Function

By default, CSS allows a maximum of 10,000 buckets to be returned during aggregation. If more than 10,000 buckets need to be returned, you can increase the value of search.max_buckets. Note that increasing the value of search.max_buckets also increases the cluster load and memory usage. Exercise caution when performing this operation.

Solution

PUT _cluster/settings
{
    "persistent": {
        "search.max_buckets": 20000
    }
}