Pipeline fails with Docker

[usen1364]

When I start the docker container, I get an error message Failed loading pipeline component 'Retriever'. See the stacktrace above for more information.
And after that, it gives the following stack trace when the /query endpoint is called

 ⠿ Container haystack-haystack-api-1  Created                                                                                                                                               0.0s
Attaching to haystack-haystack-api-1
haystack-haystack-api-1  | /opt/venv/lib/python3.10/site-packages/elasticsearch/connection/http_urllib3.py:275: DeprecationWarning: HTTPResponse.getheaders() is deprecated and will be removed in urllib3 v2.1.0. Instead access HTTPResponse.headers directly.
haystack-haystack-api-1  |   return response.status, response.getheaders(), raw_data
haystack-haystack-api-1  | 04/24/2023 05:58:23 AM Using devices: CPU - Number of GPUs: 0
haystack-haystack-api-1  | 04/24/2023 05:58:23 AM Init retriever using embeddings of model flax-sentence-embeddings/all_datasets_v3_mpnet-base
haystack-haystack-api-1  | 04/24/2023 05:58:24 AM Error loading query pipeline from /opt/pipelines/faq.yaml.
haystack-haystack-api-1  |  Failed loading pipeline component 'Retriever'. See the stacktrace above for more information.
haystack-haystack-api-1  |
haystack-haystack-api-1  | /opt/venv/lib/python3.10/site-packages/jsonschema/validators.py:282: ResourceWarning: unclosed <socket.socket fd=6, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('172.18.0.2', 45230), raddr=('192.168.65.2', 9200)>
haystack-haystack-api-1  |   for k, v in applicable_validators(_schema):
haystack-haystack-api-1  | ResourceWarning: Enable tracemalloc to get the object allocation traceback
haystack-haystack-api-1  | 04/24/2023 05:58:24 AM Error loading indexing pipeline from /opt/pipelines/faq.yaml.
haystack-haystack-api-1  |  Cannot find any pipeline with name 'indexing' declared in the YAML file. Existing pipelines: ['query']
haystack-haystack-api-1  |
haystack-haystack-api-1  | 04/24/2023 05:58:24 AM Indexing Pipeline is not setup. File Upload API will not be available.
haystack-haystack-api-1  | INFO:     Started server process [1]
haystack-haystack-api-1  | INFO:     Waiting for application startup.
haystack-haystack-api-1  | INFO:     Application startup complete.
haystack-haystack-api-1  | INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
haystack-haystack-api-1  | INFO:     172.18.0.1:47914 - "POST /query HTTP/1.1" 500 Internal Server Error
haystack-haystack-api-1  | ERROR:    Exception in ASGI application
haystack-haystack-api-1  | Traceback (most recent call last):
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/uvicorn/protocols/http/h11_impl.py", line 429, in run_asgi
haystack-haystack-api-1  |     result = await app(  # type: ignore[func-returns-value]
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 78, in __call__
haystack-haystack-api-1  |     return await self.app(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/fastapi/applications.py", line 276, in __call__
haystack-haystack-api-1  |     await super().__call__(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/applications.py", line 122, in __call__
haystack-haystack-api-1  |     await self.middleware_stack(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 184, in __call__
haystack-haystack-api-1  |     raise exc
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 162, in __call__
haystack-haystack-api-1  |     await self.app(scope, receive, _send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 84, in __call__
haystack-haystack-api-1  |     await self.app(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
haystack-haystack-api-1  |     raise exc
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
haystack-haystack-api-1  |     await self.app(scope, receive, sender)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__
haystack-haystack-api-1  |     raise e
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
haystack-haystack-api-1  |     await self.app(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/routing.py", line 718, in __call__
haystack-haystack-api-1  |     await route.handle(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/routing.py", line 276, in handle
haystack-haystack-api-1  |     await self.app(scope, receive, send)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/routing.py", line 66, in app
haystack-haystack-api-1  |     response = await func(request)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/fastapi/routing.py", line 237, in app
haystack-haystack-api-1  |     raw_response = await run_endpoint_function(
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/fastapi/routing.py", line 165, in run_endpoint_function
haystack-haystack-api-1  |     return await run_in_threadpool(dependant.call, **values)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/starlette/concurrency.py", line 41, in run_in_threadpool
haystack-haystack-api-1  |     return await anyio.to_thread.run_sync(func, *args)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/anyio/to_thread.py", line 31, in run_sync
haystack-haystack-api-1  |     return await get_asynclib().run_sync_in_worker_thread(
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 937, in run_sync_in_worker_thread
haystack-haystack-api-1  |     return await future
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 867, in run
haystack-haystack-api-1  |     result = context.run(func, *args)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/rest_api/controller/search.py", line 57, in query
haystack-haystack-api-1  |     result = _process_request(query_pipeline, request)
haystack-haystack-api-1  |   File "/opt/venv/lib/python3.10/site-packages/rest_api/controller/search.py", line 65, in _process_request
haystack-haystack-api-1  |     result = pipeline.run(query=request.query, params=params, debug=request.debug)
haystack-haystack-api-1  | AttributeError: 'NoneType' object has no attribute 'run'

Here is my docker-compose file

services:

  haystack-api:
    image: "deepset/haystack:cpu"
    volumes:
      - .:/opt/pipelines
    ports:
      - 8000:8000
    restart: on-failure
    environment:
      - DOCUMENTSTORE_PARAMS_HOST=host.docker.internal
      - PIPELINE_YAML_PATH=/opt/pipelines/faq.yaml
      - TOKENIZERS_PARALLELISM=false
      # Uncomment the following line to customise how much time (in seconds) a worker can spend serving a request
      # before it times out. This should include the time required to cache the models and setup the pipelines.

      # - GUNICORN_CMD_ARGS="--timeout=3000"

the elastic search is run outside in localhost.
And my pipeline yml file is as follows,

components:
- name: ElasticsearchDocumentStore
  params:
    index: test-index
    similarity: cosine
    host: host.docker.internal
  type: ElasticsearchDocumentStore
- name: Retriever
  params:
    document_store: ElasticsearchDocumentStore
    embedding_model: flax-sentence-embeddings/all_datasets_v3_mpnet-base
    model_format: sentence_transformers
    top_k: 6
  type: EmbeddingRetriever
- name: Generator
  params:
    model_name_or_path: vblagoje/bart_lfqa
  type: Seq2SeqGenerator
pipelines:
- name: query
  nodes:
  - inputs:
    - Query
    name: Retriever
  - inputs:
    - Retriever
    name: Generator
version: 1.15.1

Also, when I cloned Haystack and manually ran the rest API without docker, it worked without an issue.
Thanks,