diff --git a/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineRequest.java b/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineRequest.java
index 02027b1f633d2..f7415b438dfae 100644
--- a/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineRequest.java
+++ b/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineRequest.java
@@ -11,6 +11,7 @@
 
 import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.cluster.metadata.ProjectId;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.bytes.ReleasableBytesReference;
 import org.elasticsearch.common.io.stream.StreamInput;
@@ -130,6 +131,7 @@ record Parsed(Pipeline pipeline, List<IngestDocument> documents, boolean verbose
     static final String SIMULATED_PIPELINE_ID = "_simulate_pipeline";
 
     static Parsed parseWithPipelineId(
+        ProjectId projectId,
         String pipelineId,
         Map<String, Object> config,
         boolean verbose,
@@ -139,7 +141,7 @@ static Parsed parseWithPipelineId(
         if (pipelineId == null) {
             throw new IllegalArgumentException("param [pipeline] is null");
         }
-        Pipeline pipeline = ingestService.getPipeline(pipelineId);
+        Pipeline pipeline = ingestService.getPipeline(projectId, pipelineId);
         if (pipeline == null) {
             throw new IllegalArgumentException("pipeline [" + pipelineId + "] does not exist");
         }
diff --git a/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineTransportAction.java b/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineTransportAction.java
index 6b2b96fb76402..6d2f2d8044388 100644
--- a/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineTransportAction.java
+++ b/server/src/main/java/org/elasticsearch/action/ingest/SimulatePipelineTransportAction.java
@@ -17,6 +17,7 @@
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.cluster.node.DiscoveryNodes;
+import org.elasticsearch.cluster.project.ProjectResolver;
 import org.elasticsearch.common.Randomness;
 import org.elasticsearch.common.settings.Setting;
 import org.elasticsearch.common.util.concurrent.EsExecutors;
@@ -49,6 +50,7 @@ public class SimulatePipelineTransportAction extends HandledTransportAction<Simu
     private final IngestService ingestService;
     private final SimulateExecutionService executionService;
     private final TransportService transportService;
+    private final ProjectResolver projectResolver;
     private volatile TimeValue ingestNodeTransportActionTimeout;
     // ThreadLocal because our unit testing framework does not like sharing Randoms across threads
     private final ThreadLocal<Random> random = ThreadLocal.withInitial(Randomness::get);
@@ -58,7 +60,8 @@ public SimulatePipelineTransportAction(
         ThreadPool threadPool,
         TransportService transportService,
         ActionFilters actionFilters,
-        IngestService ingestService
+        IngestService ingestService,
+        ProjectResolver projectResolver
     ) {
         super(
             SimulatePipelineAction.NAME,
@@ -70,6 +73,7 @@ public SimulatePipelineTransportAction(
         this.ingestService = ingestService;
         this.executionService = new SimulateExecutionService(threadPool);
         this.transportService = transportService;
+        this.projectResolver = projectResolver;
         this.ingestNodeTransportActionTimeout = INGEST_NODE_TRANSPORT_ACTION_TIMEOUT.get(ingestService.getClusterService().getSettings());
         ingestService.getClusterService()
             .getClusterSettings()
@@ -96,9 +100,11 @@ protected void doExecute(Task task, SimulatePipelineRequest request, ActionListe
         }
         try {
             if (discoveryNodes.getLocalNode().isIngestNode()) {
+                final var projectId = projectResolver.getProjectId();
                 final SimulatePipelineRequest.Parsed simulateRequest;
                 if (request.getId() != null) {
                     simulateRequest = SimulatePipelineRequest.parseWithPipelineId(
+                        projectId,
                         request.getId(),
                         source,
                         request.isVerbose(),
diff --git a/server/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestParsingTests.java b/server/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestParsingTests.java
index 391c258b6f098..575c3e87dfcd7 100644
--- a/server/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestParsingTests.java
+++ b/server/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestParsingTests.java
@@ -44,6 +44,8 @@
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.nullValue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -61,7 +63,7 @@ public void init() throws IOException {
             (factories, tag, description, config) -> processor
         );
         ingestService = mock(IngestService.class);
-        when(ingestService.getPipeline(SIMULATED_PIPELINE_ID)).thenReturn(pipeline);
+        when(ingestService.getPipeline(any(), eq(SIMULATED_PIPELINE_ID))).thenReturn(pipeline);
         when(ingestService.getProcessorFactories()).thenReturn(registry);
     }
 
@@ -89,7 +91,9 @@ public void testParseUsingPipelineStore() throws Exception {
             expectedDocs.add(expectedDoc);
         }
 
+        var projectId = randomProjectIdOrDefault();
         SimulatePipelineRequest.Parsed actualRequest = SimulatePipelineRequest.parseWithPipelineId(
+            projectId,
             SIMULATED_PIPELINE_ID,
             requestContent,
             false,
@@ -213,24 +217,40 @@ public void testParseWithProvidedPipeline() throws Exception {
     }
 
     public void testNullPipelineId() {
+        var projectId = randomProjectIdOrDefault();
         Map<String, Object> requestContent = new HashMap<>();
         List<Map<String, Object>> docs = new ArrayList<>();
         requestContent.put(Fields.DOCS, docs);
         Exception e = expectThrows(
             IllegalArgumentException.class,
-            () -> SimulatePipelineRequest.parseWithPipelineId(null, requestContent, false, ingestService, RestApiVersion.current())
+            () -> SimulatePipelineRequest.parseWithPipelineId(
+                projectId,
+                null,
+                requestContent,
+                false,
+                ingestService,
+                RestApiVersion.current()
+            )
         );
         assertThat(e.getMessage(), equalTo("param [pipeline] is null"));
     }
 
     public void testNonExistentPipelineId() {
+        var projectId = randomProjectIdOrDefault();
         String pipelineId = randomAlphaOfLengthBetween(1, 10);
         Map<String, Object> requestContent = new HashMap<>();
         List<Map<String, Object>> docs = new ArrayList<>();
         requestContent.put(Fields.DOCS, docs);
         Exception e = expectThrows(
             IllegalArgumentException.class,
-            () -> SimulatePipelineRequest.parseWithPipelineId(pipelineId, requestContent, false, ingestService, RestApiVersion.current())
+            () -> SimulatePipelineRequest.parseWithPipelineId(
+                projectId,
+                pipelineId,
+                requestContent,
+                false,
+                ingestService,
+                RestApiVersion.current()
+            )
         );
         assertThat(e.getMessage(), equalTo("pipeline [" + pipelineId + "] does not exist"));
     }