diff --git a/spec/schemas/ingest.simulate.yaml b/spec/schemas/ingest.simulate.yaml
index 4b525dbf6..3a23f027b 100644
--- a/spec/schemas/ingest.simulate.yaml
+++ b/spec/schemas/ingest.simulate.yaml
@@ -48,8 +48,7 @@ components:
         _source:
           description: JSON body for the document.
           type: object
-          additionalProperties:
-            type: object
+          additionalProperties: true
         _version:
           $ref: '_common.yaml#/components/schemas/StringifiedVersionNumber'
         _version_type:
diff --git a/tests/default/ingest/pipeline.yaml b/tests/default/ingest/pipeline.yaml
new file mode 100644
index 000000000..66724ce81
--- /dev/null
+++ b/tests/default/ingest/pipeline.yaml
@@ -0,0 +1,65 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test the creation of an ingest pipeline.
+epilogues:
+  - path: /_ingest/pipeline/books_pipeline
+    method: DELETE
+    status: [200, 404]
+  - path: /_ingest/pipeline/movies_pipeline
+    method: DELETE
+    status: [200, 404]
+version: '>= 2.11'
+chapters:
+  - synopsis: Create a books ingest pipeline.
+    path: /_ingest/pipeline/{id}
+    method: PUT
+    parameters:
+      id: books_pipeline
+    request:
+      payload:
+        description: A books pipeline that does nothing.
+        processors: []
+    response:
+      status: 200
+      payload:
+        acknowledged: true
+  - synopsis: Create a movies ingest pipeline.
+    path: /_ingest/pipeline/{id}
+    method: PUT
+    parameters:
+      id: movies_pipeline
+    request:
+      payload:
+        description: A movies pipeline that does nothing.
+        processors: []
+    response:
+      status: 200
+      payload:
+        acknowledged: true
+  - synopsis: Query created books pipeline.
+    path: /_ingest/pipeline/{id}
+    method: GET
+    parameters:
+      id: books_pipeline
+    response:
+      status: 200
+      payload:
+        books_pipeline:
+          description: A books pipeline that does nothing.
+  - synopsis: Query all pipelines.
+    path: /_ingest/pipeline
+    method: GET
+    response:
+      status: 200
+      payload:
+        books_pipeline:
+          description: A books pipeline that does nothing.
+        movies_pipeline:
+          description: A movies pipeline that does nothing.
+  - synopsis: Delete the books pipeline.
+    path: /_ingest/pipeline/{id}
+    method: DELETE
+    parameters:
+      id: books_pipeline
+    response:
+      status: 200
diff --git a/tests/default/ingest/pipeline/simulate.yaml b/tests/default/ingest/pipeline/simulate.yaml
new file mode 100644
index 000000000..7124715f6
--- /dev/null
+++ b/tests/default/ingest/pipeline/simulate.yaml
@@ -0,0 +1,86 @@
+$schema: ../../../../json_schemas/test_story.schema.yaml
+
+description: Test the simulation of an ingest pipeline.
+version: '>= 2.11'
+epilogues:
+  - path: /_ingest/pipeline/movies_pipeline
+    method: DELETE
+    status: [200, 404]
+prologues:
+  - path: /_ingest/pipeline/movies_pipeline
+    method: PUT
+    request:
+      payload:
+        description: A movies pipeline that does nothing.
+        processors: []
+chapters:
+  - synopsis: Simulate an existing ingest pipeline (GET).
+    path: /_ingest/pipeline/{id}/_simulate
+    method: GET
+    parameters:
+      id: movies_pipeline
+      verbose: true
+    request:
+      payload:
+        docs:
+          - _index: movies
+            _id: '1'
+            _source:
+              title: The Cruise
+              director: Bennett Miller,
+              year: 1998
+    response:
+      status: 200
+      payload:
+        docs:
+          - processor_results: []
+  - synopsis: Simulate an existing ingest pipeline (POST).
+    path: /_ingest/pipeline/{id}/_simulate
+    method: POST
+    parameters:
+      id: movies_pipeline
+    request:
+      payload:
+        docs:
+          - _index: movies
+            _id: '1'
+            _source:
+              title: The Cruise
+              director: Bennett Miller,
+              year: 1998
+    response:
+      status: 200
+  - synopsis: Simulate an ingest pipeline with the pipeline in the request body (GET).
+    path: /_ingest/pipeline/_simulate
+    method: GET
+    request:
+      payload:
+        pipeline:
+          description: A movies pipeline that does nothing.
+          processors: []
+        docs:
+          - _index: movies
+            _id: '1'
+            _source:
+              title: The Cruise
+              director: Bennett Miller,
+              year: 1998
+    response:
+      status: 200
+  - synopsis: Simulate an ingest pipeline with the pipeline in the request body (POST).
+    path: /_ingest/pipeline/_simulate
+    method: POST
+    request:
+      payload:
+        pipeline:
+          description: A movies pipeline that does nothing.
+          processors: []
+        docs:
+          - _index: movies
+            _id: '1'
+            _source:
+              title: The Cruise
+              director: Bennett Miller,
+              year: 1998
+    response:
+      status: 200