fix #2631 add getEngineInfo

src/main/java/org/codelibs/fess/es/client/SearchEngineClient.java

@@ -51,6 +51,7 @@ import org.codelibs.core.io.ResourceUtil;
 import org.codelibs.core.lang.StringUtil;
 import org.codelibs.core.lang.ThreadUtil;
 import org.codelibs.curl.CurlResponse;
+import org.codelibs.fesen.client.EngineInfo;
 import org.codelibs.fesen.client.HttpClient;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.entity.FacetInfo;
@@ -1411,6 +1412,13 @@ public class SearchEngineClient implements Client {
         this.clusterName = clusterName;
     }
 
+    public EngineInfo getEngineInfo() {
+        if (client instanceof HttpClient httpClient) {
+            return httpClient.getEngineInfo();
+        }
+        throw new SearchEngineClientException("client is not HttpClient.");
+    }
+
     //
     // Fesen Client
     //