diff --git a/src/main/java/org/opensearch/security/configuration/DlsFilterLevelActionHandler.java b/src/main/java/org/opensearch/security/configuration/DlsFilterLevelActionHandler.java
index f56eae4c5d..09364238e1 100644
--- a/src/main/java/org/opensearch/security/configuration/DlsFilterLevelActionHandler.java
+++ b/src/main/java/org/opensearch/security/configuration/DlsFilterLevelActionHandler.java
@@ -25,8 +25,8 @@
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.Logger;
 import org.opensearch.OpenSearchSecurityException;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.ActionRequest;
@@ -69,7 +69,7 @@
 import org.opensearch.security.support.SecurityUtils;
 
 public class DlsFilterLevelActionHandler {
-    private static final Logger log = LogManager.getLogger(DlsFilterLevelActionHandler.class);
+    private static final Logger log = LoggerFactory.getLogger(DlsFilterLevelActionHandler.class);
 
     private static final Function<SearchRequest, String> LOCAL_CLUSTER_ALIAS_GETTER = ReflectiveAttributeAccessors
             .protectedObjectAttr("localClusterAlias", String.class);
diff --git a/src/main/java/org/opensearch/security/configuration/DlsQueryParser.java b/src/main/java/org/opensearch/security/configuration/DlsQueryParser.java
index cf533dcb91..7881038a83 100644
--- a/src/main/java/org/opensearch/security/configuration/DlsQueryParser.java
+++ b/src/main/java/org/opensearch/security/configuration/DlsQueryParser.java
@@ -21,8 +21,8 @@
 import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.Logger;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.BooleanClause.Occur;
 import org.apache.lucene.search.BooleanQuery;
@@ -48,7 +48,7 @@
 
 public final class DlsQueryParser {
 
-    private static final Logger log = LogManager.getLogger(DlsQueryParser.class);
+    private static final Logger log = LoggerFactory.getLogger(DlsQueryParser.class);
     private static final Query NON_NESTED_QUERY;
 
     static {
diff --git a/src/test/java/org/opensearch/security/dlic/dlsfls/AbstractDlsFlsTest.java b/src/test/java/org/opensearch/security/dlic/dlsfls/AbstractDlsFlsTest.java
index 556252685e..2ea9bf4462 100644
--- a/src/test/java/org/opensearch/security/dlic/dlsfls/AbstractDlsFlsTest.java
+++ b/src/test/java/org/opensearch/security/dlic/dlsfls/AbstractDlsFlsTest.java
@@ -20,7 +20,6 @@
 import java.util.Map;
 import java.util.Set;
 
-import org.apache.logging.log4j.util.Strings;
 import org.junit.Assert;
 import org.opensearch.action.get.GetResponse;
 import org.opensearch.action.get.MultiGetResponse;
@@ -103,11 +102,11 @@ protected MultiSearchResponse executeMSearchMatchAll(String user, String passwor
 
     protected MultiGetResponse executeMGet(String user, String password, Map<String, String> indicesAndIds) throws Exception {
 		
-		Set<String> indexAndIdJson = new HashSet<>();	
+		Set<String> indexAndIdJson = new HashSet<>();
 		for (Map.Entry<String, String> indexAndId : indicesAndIds.entrySet()) {
 			indexAndIdJson.add("{ \"_index\": \""+indexAndId.getKey()+"\", \"_id\": \""+indexAndId.getValue()+"\" }");
 		}
-		String body = "{ \"docs\": ["+ Strings.join(indexAndIdJson, ',') +"] }";
+		String body = "{ \"docs\": ["+ String.join(",", indexAndIdJson) +"] }";
 		
     	HttpResponse response = rh.executePostRequest("/_mget?pretty", body,encodeBasicHeader(user, password));
 		Assert.assertEquals(200, response.getStatusCode());