Error in pipeline aggregation Elastic search

Elastic Stack Elasticsearch
1

AggregationBuilder aggregationBuilder = AggregationBuilders.terms("Frequency").
field("fieldName").minDocCount(1).size(Integer.MAX_VALUE);
aggregationBuilder.subAggregation(AggregationBuilders.count("count"));
PipelineAggregationBuilder pipelineAggregationBuilder = PipelineAggregatorBuilders.
statsBucket("extended_stats_bucket", "Frequency>count");

    SearchRequest searchRequest = new SearchRequest("indexName");
    searchRequest.types(indexType);
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.aggregation(aggregationBuilder);
    searchSourceBuilder.aggregation(pipelineAggregationBuilder);
    searchRequest.source(searchSourceBuilder);  


  SearchResponse searchResponse = highLevelClient.search(searchRequest);

getting below error
ElasticsearchStatusException[Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_state_exception, reason=value source config is inv alid; must have either a field context or a script or marked as unwrapped]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_state_exception, reason=value source config is invalid; must have either a field context or a script or marked as unwrapped]];**

2

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