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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

Run the following command on the Dev Tools page of Kibana:

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