1 public long countDistinctField(String esIndex, String countField, SearchSourceBuilder sourceBuilder) {
2 long count = 0;
3 if (StringUtils.isBlank(esIndex) || StringUtils.isBlank(countField)) {
4 return count;
5 }
6
7 SearchRequest searchRequest = new SearchRequest();
8 searchRequest.indices(esIndex);
9 String identifier = UUID.randomUUID().toString();
10 AggregationBuilder aggregationBuilder = AggregationBuilders.cardinality(identifier).field(countField);
11 sourceBuilder.aggregation(aggregationBuilder);
12 sourceBuilder.size(0);
13 searchRequest.source(sourceBuilder);
14 try {
15 SearchResponse result = client.search(searchRequest, RequestOptions.DEFAULT);
16 Histogram histogram = (Histogram) result.getAggregations().asMap().get(countField);
17 long total_value = 0;
18 for (Histogram.Bucket t : histogram.getBuckets()) {
19 Cardinality cardinality = t.getAggregations().get(identifier);
20 long value = cardinality.getValue();
21 total_value = total_value + value;
22 }
23 return total_value;
24 } catch (Exception e) {
25 log.error("Count field failed!", e);
26 }
27 return 0;
28 }
