diff --git a/qa/os/src/test/java/org/elasticsearch/packaging/test/ConfigurationTests.java b/qa/os/src/test/java/org/elasticsearch/packaging/test/ConfigurationTests.java
index 28e7fdad74032..57b5d9c5b7e80 100644
--- a/qa/os/src/test/java/org/elasticsearch/packaging/test/ConfigurationTests.java
+++ b/qa/os/src/test/java/org/elasticsearch/packaging/test/ConfigurationTests.java
@@ -24,8 +24,14 @@
 import org.elasticsearch.packaging.util.Platforms;
 import org.junit.Before;
 
+import java.nio.file.Files;
+import java.util.List;
+
+import static java.nio.file.StandardOpenOption.APPEND;
+import static java.nio.file.StandardOpenOption.CREATE;
 import static org.elasticsearch.packaging.util.FileUtils.append;
 import static org.elasticsearch.packaging.util.ServerUtils.makeRequest;
+import static org.hamcrest.CoreMatchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assume.assumeFalse;
 
@@ -40,6 +46,19 @@ public void test10Install() throws Exception {
         install();
     }
 
+    public void test50StrictDuplicateDetectionDeprecationWarning() throws Exception {
+        withCustomConfig(tempConf -> {
+            final List<String> jvmOptions = org.elasticsearch.common.collect.List.of("-Des.xcontent.strict_duplicate_detection=false");
+            Files.write(tempConf.resolve("jvm.options"), jvmOptions, CREATE, APPEND);
+            startElasticsearch();
+            stopElasticsearch();
+        });
+        assertThat(
+            FileUtils.slurp(installation.logs.resolve("elasticsearch_deprecation.log")),
+            containsString("The Java option es.xcontent.strict_duplicate_detection is set")
+        );
+    }
+
     public void test60HostnameSubstitution() throws Exception {
         String hostnameKey = Platforms.WINDOWS ? "COMPUTERNAME" : "HOSTNAME";
         sh.getEnv().put(hostnameKey, "mytesthost");
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java b/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
index 12d93bece67d5..b16fdf07f352b 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
@@ -364,6 +364,14 @@ static void init(
                 System.getProperty("java.home"));
             DeprecationLogger.getLogger(Bootstrap.class).deprecate("java_version_11_required", message);
         }
+        if (BootstrapInfo.getSystemProperties().get("es.xcontent.strict_duplicate_detection") != null) {
+            final String message = String.format(
+                Locale.ROOT,
+                "The Java option es.xcontent.strict_duplicate_detection is set to [%s]; " +
+                    "this option is deprecated and non-functional and should be removed from Java configuration.",
+                BootstrapInfo.getSystemProperties().get("es.xcontent.strict_duplicate_detection"));
+            DeprecationLogger.getLogger(Bootstrap.class).deprecate("strict_duplicate_detection_setting_removed", message);
+        }
         if (environment.pidFile() != null) {
             try {
                 PidFile.create(environment.pidFile(), true);