diff --git a/x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java b/x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java
index fe456256e46c8..6afea6faa607e 100644
--- a/x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java
+++ b/x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java
@@ -41,6 +41,7 @@
 import org.elasticsearch.common.unit.ByteSizeUnit;
 import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.core.Strings;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.discovery.DiscoveryModule;
 import org.elasticsearch.index.IndexVersion;
@@ -846,7 +847,7 @@ public void testToXContent() throws IOException {
               }
             }""";
         assertEquals(
-            stripWhitespace(String.format(expectedJson + (CCS_TELEMETRY_FEATURE_FLAG.isEnabled() ? ccsOutput : "") + suffixJson, args)),
+            stripWhitespace(Strings.format(expectedJson + (CCS_TELEMETRY_FEATURE_FLAG.isEnabled() ? ccsOutput : "") + suffixJson, args)),
             xContent.utf8ToString()
         );
     }