[Discussion] We should use same port for dataprep microservice layer.

[yongfengdu]

Per my understand, the microservice layer is to define consistent/well-defined APIs to hide the difference of implementations.
When a user is composing pipelines, he can switch between different backends with least effort.
So, for the dataprep(comps/dataprep) category, it's better to expose the same port.
The milvus and redis implementation are using different port: 6010 and 6007.
A grep shows that 6008 and 6009 are also used, maybe for different purpose.

GenAIComps/comps/dataprep$ grep -R "port=" *
milvus/langchain/README.md:your_port=6010
milvus/langchain/prepare_doc_milvus.py:@register_microservice(name="opea_service@prepare_doc_milvus", endpoint="/v1/dataprep", host="0.0.0.0", port=6010)
milvus/langchain/prepare_doc_milvus.py: name="opea_service@prepare_doc_milvus", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6010
milvus/langchain/prepare_doc_milvus.py: name="opea_service@prepare_doc_milvus", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6010
multimodal/redis/langchain/prepare_videodoc_redis.py: name="opea_service@prepare_videodoc_redis", endpoint="/v1/generate_transcripts", host="0.0.0.0", port=6007
multimodal/redis/langchain/prepare_videodoc_redis.py: name="opea_service@prepare_videodoc_redis", endpoint="/v1/generate_captions", host="0.0.0.0", port=6007
multimodal/redis/langchain/prepare_videodoc_redis.py: port=6007,
multimodal/redis/langchain/prepare_videodoc_redis.py: name="opea_service@prepare_videodoc_redis", endpoint="/v1/dataprep/get_videos", host="0.0.0.0", port=6007
multimodal/redis/langchain/prepare_videodoc_redis.py: name="opea_service@prepare_videodoc_redis", endpoint="/v1/dataprep/delete_videos", host="0.0.0.0", port=6007
neo4j/langchain/prepare_doc_neo4j.py: port=6007,
pgvector/langchain/prepare_doc_pgvector.py: connection = psycopg2.connect(database=database, user=username, password=password, host=hostname, port=port)
pgvector/langchain/prepare_doc_pgvector.py: port=6007,
pgvector/langchain/prepare_doc_pgvector.py: name="opea_service@prepare_doc_pgvector", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6007
pgvector/langchain/prepare_doc_pgvector.py: name="opea_service@prepare_doc_pgvector", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6007
pinecone/langchain/prepare_doc_pinecone.py:@register_microservice(name="opea_service@prepare_doc_pinecone", endpoint="/v1/dataprep", host="0.0.0.0", port=6007)
pinecone/langchain/prepare_doc_pinecone.py: name="opea_service@prepare_doc_pinecone_file", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6008
pinecone/langchain/prepare_doc_pinecone.py: name="opea_service@prepare_doc_pinecone_del", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6009
qdrant/langchain/prepare_doc_qdrant.py: port=QDRANT_PORT,
qdrant/langchain/prepare_doc_qdrant.py: port=6007,
redis/README.md:your_port=6006
redis/langchain_ray/prepare_doc_redis_on_ray.py:@register_microservice(name="opea_service@prepare_doc_redis", endpoint="/v1/dataprep", host="0.0.0.0", port=6007)
redis/langchain_ray/prepare_doc_redis_on_ray.py: name="opea_service@prepare_doc_redis_file", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6008
redis/langchain_ray/prepare_doc_redis_on_ray.py: name="opea_service@prepare_doc_redis_del", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6009
redis/llama_index/prepare_doc_redis.py:@register_microservice(name="opea_service@prepare_doc_redis", endpoint="/v1/dataprep", host="0.0.0.0", port=6007)
redis/llama_index/prepare_doc_redis.py: name="opea_service@prepare_doc_redis_file", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6008
redis/llama_index/prepare_doc_redis.py: name="opea_service@prepare_doc_redis_del", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6009
redis/langchain/prepare_doc_redis.py:@register_microservice(name="opea_service@prepare_doc_redis", endpoint="/v1/dataprep", host="0.0.0.0", port=6007)
redis/langchain/prepare_doc_redis.py: name="opea_service@prepare_doc_redis", endpoint="/v1/dataprep/get_file", host="0.0.0.0", port=6007
redis/langchain/prepare_doc_redis.py: name="opea_service@prepare_doc_redis", endpoint="/v1/dataprep/delete_file", host="0.0.0.0", port=6007
vdms/multimodal_langchain/ingest_videos.py:@register_microservice(name="opea_service@prepare_videodoc_vdms", endpoint="/v1/dataprep", host="0.0.0.0", port=6007)
vdms/multimodal_langchain/ingest_videos.py: port=6007,
vdms/multimodal_langchain/ingest_videos.py: port=6007,
vdms/multimodal_langchain/utils/store_embeddings.py: self.client = VDMS_Client(host=self.host, port=self.port)
vdms/langchain/prepare_doc_vdms.py: port=6007,