test connectTimeout of ConnectionConfig

Signed-off-by: Leo <yggb159@gmail.com>

Author: Leo

java-client/src/test/java/org/opensearch/client/transport/httpclient5/ApacheHttpClient5TransportBuilderTest.java

@@ -0,0 +1,46 @@
+package org.opensearch.client.transport.httpclient5;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.apache.hc.client5.http.ConnectTimeoutException;
+import org.apache.hc.client5.http.config.ConnectionConfig;
+import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
+import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
+import org.apache.hc.core5.http.HttpHost;
+import org.apache.hc.core5.util.Timeout;
+import org.junit.Test;
+import org.opensearch.client.opensearch.OpenSearchClient;
+import org.opensearch.client.opensearch.core.SearchRequest;
+
+import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
+
+public class ApacheHttpClient5TransportBuilderTest {
+
+    @Test
+    public void timeOutTest() {
+
+        int expectTime = 10;
+        String expectMessage = expectTime + " MILLISECONDS";
+
+        ApacheHttpClient5Transport apacheHttpClient5Transport = ApacheHttpClient5TransportBuilder.builder(new HttpHost("10.255.255.1", 9200))
+            .setHttpClientConfigCallback(httpClientBuilder -> {
+
+                ConnectionConfig connectionConfig = ConnectionConfig.custom()
+                    .setConnectTimeout(Timeout.ofMilliseconds(expectTime))
+                    .build();
+
+                PoolingAsyncClientConnectionManager connectionManager = PoolingAsyncClientConnectionManagerBuilder
+                    .create()
+                    .setDefaultConnectionConfig(connectionConfig)
+                    .build();
+
+                return httpClientBuilder.setConnectionManager(connectionManager);
+            }).build();
+
+        OpenSearchClient osClient = new OpenSearchClient(apacheHttpClient5Transport);
+
+        ConnectTimeoutException exception = assertThrows(ConnectTimeoutException.class, () -> osClient.search(SearchRequest.of(sb -> sb.index("index")), JsonNode.class));
+
+        assertTrue("Expected timeout value not found in message", exception.getMessage().contains(expectMessage));
+    }
+}