error handling changes

Author: Trianz-Akshay

athena-elasticsearch/src/main/java/com/amazonaws/athena/connectors/elasticsearch/AwsRestHighLevelClient.java

@@ -24,9 +24,6 @@
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.services.glue.model.ErrorDetails;
 import com.amazonaws.services.glue.model.FederationSourceErrorCode;
-import com.amazonaws.services.glue.model.AccessDeniedException;
-import com.amazonaws.services.glue.model.ErrorDetails;
-import com.amazonaws.services.glue.model.FederationSourceErrorCode;
 import com.google.common.base.Splitter;
 import org.apache.http.HttpHost;
 import org.apache.http.HttpRequestInterceptor;