Add BooleanQuery.hasClauses() (#525)

java-client/src/main/java/co/elastic/clients/elasticsearch/_types/query_dsl/BoolQuery.java

@@ -331,6 +331,16 @@ public BoolQuery build() {
 
 			return new BoolQuery(this);
 		}
+
+		/**
+		 * Returns <code>true</code> if this query has at least one should, must, must
+		 * not or filter clause.
+		 */
+		public boolean hasClauses() {
+			return !(this.must == null || this.must.isEmpty()) || !(this.mustNot == null || this.mustNot.isEmpty())
+					|| !(this.should == null || this.should.isEmpty())
+					|| !(this.filter == null || this.filter.isEmpty());
+		}
 	}
 
 	// ---------------------------------------------------------------------------------------------
@@ -351,4 +361,12 @@ protected static void setupBoolQueryDeserializer(ObjectDeserializer<BoolQuery.Bu
 
 	}
 
+	/**
+	 * Returns <code>true</code> if this query has at least one should, must, must
+	 * not or filter clause.
+	 */
+	public boolean hasClauses() {
+		return !(this.must == null || this.must.isEmpty()) || !(this.mustNot == null || this.mustNot.isEmpty())
+				|| !(this.should == null || this.should.isEmpty()) || !(this.filter == null || this.filter.isEmpty());
+	}
 }

java-client/src/test/java/co/elastic/clients/elasticsearch/model/CodeAdditionsTests.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package co.elastic.clients.elasticsearch.model;
+
+import co.elastic.clients.elasticsearch._types.query_dsl.BoolQuery;
+import co.elastic.clients.elasticsearch._types.query_dsl.QueryBuilders;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class CodeAdditionsTests extends Assertions {
+
+    @Test
+    public void testHasClauses() {
+
+        {
+            BoolQuery.Builder builder = new BoolQuery.Builder();
+            assertFalse(builder.hasClauses());
+
+            BoolQuery query = builder.build();
+            assertFalse(query.hasClauses());
+        }
+
+        {
+            BoolQuery.Builder builder = new BoolQuery.Builder();
+            builder.must(QueryBuilders.matchAll(b -> b));
+            assertTrue(builder.hasClauses());
+
+            BoolQuery query = builder.build();
+            assertTrue(query.hasClauses());
+        }
+    }
+}