diff --git a/docs/changelog/88413.yaml b/docs/changelog/88413.yaml
new file mode 100644
index 0000000000000..5b2a172b1ba6e
--- /dev/null
+++ b/docs/changelog/88413.yaml
@@ -0,0 +1,5 @@
+pr: 88413
+summary: Ensure `CreateApiKey` always creates a new document
+area: Security
+type: bug
+issues: []
diff --git a/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java b/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
index 447ff9191ab6f..96b7ad03dc042 100644
--- a/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
+++ b/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
@@ -304,6 +304,7 @@ private void createApiKeyAndIndexIt(
                 final IndexRequest indexRequest = client.prepareIndex(SECURITY_MAIN_ALIAS)
                     .setSource(builder)
                     .setId(request.getId())
+                    .setOpType(DocWriteRequest.OpType.CREATE)
                     .setRefreshPolicy(request.getRefreshPolicy())
                     .request();
                 final BulkRequest bulkRequest = toSingleItemBulkRequest(indexRequest);
@@ -317,6 +318,7 @@ private void createApiKeyAndIndexIt(
                         bulkRequest,
                         TransportSingleItemBulkWriteAction.<IndexResponse>wrapBulkResponse(ActionListener.wrap(indexResponse -> {
                             assert request.getId().equals(indexResponse.getId());
+                            assert indexResponse.getResult() == DocWriteResponse.Result.CREATED;
                             final ListenableFuture<CachedApiKeyHashResult> listenableFuture = new ListenableFuture<>();
                             listenableFuture.onResponse(new CachedApiKeyHashResult(true, apiKey));
                             apiKeyAuthCache.put(request.getId(), listenableFuture);
diff --git a/x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java b/x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
index 338dea27b9936..c67ce159250bc 100644
--- a/x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
+++ b/x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
@@ -206,6 +206,8 @@ public void testCreateApiKeyUsesBulkIndexAction() throws Exception {
             assertThat(bulkRequest.requests().get(0), instanceOf(IndexRequest.class));
             IndexRequest indexRequest = (IndexRequest) bulkRequest.requests().get(0);
             assertThat(indexRequest.id(), is(createApiKeyRequest.getId()));
+            // The index request has opType create so that it will *not* override any existing document
+            assertThat(indexRequest.opType(), is(DocWriteRequest.OpType.CREATE));
             bulkActionInvoked.set(true);
             return null;
         }).when(client).execute(eq(BulkAction.INSTANCE), any(BulkRequest.class), any());