Update DocIndexRetriever Example to allow user passing in retriever/reranker params (#880)

Signed-off-by: minmin-intel <minmin.hou@intel.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

DocIndexRetriever/docker_compose/intel/hpu/gaudi/README.md

@@ -80,13 +80,26 @@ Retrieval from KnowledgeBase
 
 ```bash
 curl http://${host_ip}:8889/v1/retrievaltool -X POST -H "Content-Type: application/json" -d '{
-     "text": "Explain the OPEA project?"
+     "messages": "Explain the OPEA project?"
      }'
 
 # expected output
 {"id":"354e62c703caac8c547b3061433ec5e8","reranked_docs":[{"id":"06d5a5cefc06cf9a9e0b5fa74a9f233c","text":"Close SearchsearchMenu WikiNewsCommunity Daysx-twitter linkedin github searchStreamlining implementation of enterprise-grade Generative AIEfficiently integrate secure, performant, and cost-effective Generative AI workflows into business value.TODAYOPEA..."}],"initial_query":"Explain the OPEA project?"}
 ```
 
+**Note**: `messages` is the required field. You can also pass in parameters for the retriever and reranker in the request. The parameters that can changed are listed below.
+
+    1. retriever
+    * search_type: str = "similarity"
+    * k: int = 4
+    * distance_threshold: Optional[float] = None
+    * fetch_k: int = 20
+    * lambda_mult: float = 0.5
+    * score_threshold: float = 0.2
+
+    2. reranker
+    * top_n: int = 1
+
 ## 5. Trouble shooting
 
 1. check all containers are alive

DocIndexRetriever/docker_compose/intel/hpu/gaudi/compose.yaml

@@ -77,13 +77,30 @@ services:
       REDIS_URL: ${REDIS_URL}
       INDEX_NAME: ${INDEX_NAME}
     restart: unless-stopped
+  tei-reranking-service:
+    image: ghcr.io/huggingface/text-embeddings-inference:cpu-1.5
+    container_name: tei-reranking-gaudi-server
+    ports:
+      - "8808:80"
+    volumes:
+      - "./data:/data"
+    shm_size: 1g
+    environment:
+      no_proxy: ${no_proxy}
+      http_proxy: ${http_proxy}
+      https_proxy: ${https_proxy}
+      HUGGINGFACEHUB_API_TOKEN: ${HUGGINGFACEHUB_API_TOKEN}
+      HF_HUB_DISABLE_PROGRESS_BARS: 1
+      HF_HUB_ENABLE_HF_TRANSFER: 0
+    command: --model-id ${RERANK_MODEL_ID} --auto-truncate
   reranking:
     image: ${REGISTRY:-opea}/reranking-tei:${TAG:-latest}
     container_name: reranking-tei-gaudi-server
+    depends_on:
+      - tei-reranking-service
     ports:
       - "8000:8000"
     ipc: host
-    entrypoint: python local_reranking.py
     environment:
       no_proxy: ${no_proxy}
       http_proxy: ${http_proxy}