feat(elasticsearch): add count method to ElasticsearchService and update hasChildren logic in ElasticsearchResource

Author: mjabascal10

backend/src/main/java/com/park/utmstack/service/elasticsearch/ElasticsearchService.java

@@ -22,6 +22,7 @@
 import org.elasticsearch.index.query.BoolQueryBuilder;
 import org.opensearch.client.opensearch._types.SortOrder;
 import org.opensearch.client.opensearch._types.query_dsl.Query;
+import org.opensearch.client.opensearch.cat.CountResponse;
 import org.opensearch.client.opensearch.cat.indices.IndicesRecord;
 import org.opensearch.client.opensearch.core.CountRequest;
 import org.opensearch.client.opensearch.core.IndexResponse;
@@ -346,6 +347,22 @@ public boolean exists(List<FilterType> filters, String indexPattern) {
         }
     }
 
+    public long count(List<FilterType> filters, String indexPattern) {
+        final String ctx = CLASSNAME + ".count";
+        try {
+            SearchRequest.Builder srb = new SearchRequest.Builder()
+                    .index(indexPattern)
+                    .query(SearchUtil.toQuery(filters))
+                    .size(0);
+
+            SearchResponse<Object> response = search(srb.build(), Object.class);
+            return response.hits().total().value();
+        } catch (Exception e) {
+            throw new RuntimeException(ctx + ": " + e.getMessage(), e);
+        }
+    }
+
+
     public <T> SearchResponse<T> search(SearchRequest request, Class<T> type) {
         final String ctx = CLASSNAME + ".search";
         try {

backend/src/main/java/com/park/utmstack/web/rest/elasticsearch/ElasticsearchResource.java

@@ -169,11 +169,12 @@ public ResponseEntity<List<Map>> search(@RequestBody(required = false) List<Filt
                 results.forEach(d -> {
                     Object id = d.get("id");
                     if (id != null) {
-                        boolean hasChildren = elasticsearchService.exists(
+                        long countEchoes = elasticsearchService.count(
                                 List.of(new FilterType("parentId", OperatorType.IS,  id.toString())),
                                 indexPattern
                         );
-                        d.put("hasChildren", hasChildren);
+                        d.put("hasChildren", countEchoes > 0);
+                        d.put("echoes", countEchoes);
                     }
                 });
             }