add license headers in new files

Signed-off-by: Surya Sashank Nistala <snistala@amazon.com>

src/main/java/org/opensearch/securityanalytics/correlation/alert/CorrelationAlertService.java

@@ -1,3 +1,7 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
 package org.opensearch.securityanalytics.correlation.alert;
 
 import org.apache.logging.log4j.LogManager;
@@ -8,27 +12,18 @@
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.xcontent.LoggingDeprecationHandler;
-import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.core.action.ActionListener;
-import org.opensearch.core.common.bytes.BytesReference;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
-import org.opensearch.core.xcontent.ToXContent;
-import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.core.xcontent.XContentParser;
-import org.opensearch.rest.BytesRestResponse;
-import org.opensearch.rest.RestResponse;
 import org.opensearch.search.SearchHit;
 import org.opensearch.securityanalytics.model.CorrelationAlert;
-import org.opensearch.securityanalytics.model.Detector;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-import static org.opensearch.core.rest.RestStatus.OK;
-
 public class CorrelationAlertService {
     public static final String CORRELATION_ALERT_INDEX = ".opensearch-sap-correlations-alerts";
     private static final Logger log = LogManager.getLogger(CorrelationAlertService.class);

src/main/java/org/opensearch/securityanalytics/model/CorrelationAlert.java

@@ -1,3 +1,7 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
 package org.opensearch.securityanalytics.model;
 
 import org.apache.logging.log4j.LogManager;