ExtraLabels map[string]string

	// Loader functions to load metrics. Only one of these will be set. Metrics
	// returned by these functions must be present in the `Descriptors` list.
	loader       MetricsLoaderFn
	bucketLoader BucketMetricsLoaderFn

	// Cache for all metrics groups. Set via `.SetCache` method.
	cache *metricsCache

	// managed values follow:

	// map of metric descriptors by metric name.

        }
    }

    /**
     * Converts the sort string into a BucketOrder object for OpenSearch aggregations.
     * Parses sort configuration like "count.desc" or "term.asc" into appropriate bucket ordering.
     *
     * @return the BucketOrder instance representing the sort configuration
     */
    public BucketOrder getBucketOrder() {
        if (StringUtil.isNotBlank(sort)) {

import org.codelibs.fess.taglib.FessFunctions;
import org.dbflute.optional.OptionalEntity;
import org.opensearch.search.aggregations.AggregationBuilders;
import org.opensearch.search.aggregations.BucketOrder;
import org.opensearch.search.aggregations.bucket.histogram.DateHistogramInterval;
import org.opensearch.search.aggregations.bucket.histogram.Histogram;
import org.opensearch.search.aggregations.bucket.terms.Terms;

import org.codelibs.fess.util.ComponentUtil;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.search.aggregations.AggregationBuilders;
import org.opensearch.search.aggregations.BucketOrder;
import org.opensearch.search.aggregations.bucket.terms.Terms;
import org.opensearch.search.aggregations.bucket.terms.Terms.Bucket;
import org.opensearch.search.aggregations.bucket.terms.TermsAggregationBuilder;

/**