mention OpenSearchHybridRetrieval in OpenSearch integration page

[davidsbatista]

No description provided.

[julian-risch]

I made some suggestions for the usage example. You could discuss with @bilgeyucel and @dfokina , if we want to include the OpenSearchHybridRetriever in the integration page with a usage example or only link to the documentation pages. The other retrievers aren't described on the integrations page either. I suggest we at least link to the documentation pages of the document store and the three components.

[julian-risch]

This usage example can't work. Pipeline is not imported, not initialized and we're not adding the retriever to the pipeline. There are also no documents in the document store.

You could extend the following. It's based on the example we used in the 2.13.0 release https://github.com/deepset-ai/haystack/releases/tag/v2.13.0
Please add the embedder, adjust dimensions param of the doc store and test it.

# pip install haystack-ai datasets "sentence-transformers>=3.0.0"

from haystack import Document
from haystack.components.embedders import SentenceTransformersTextEmbedder
from haystack_integrations.components.retrievers.opensearch import OpenSearchHybridRetriever
from haystack_integrations.document_stores.opensearch import OpenSearchDocumentStore
from datasets import load_dataset

dataset = load_dataset("HaystackBot/medrag-pubmed-chunk-with-embeddings", split="train")
docs = [Document(content=doc["contents"], embedding=doc["embedding"]) for doc in dataset]
document_store = OpenSearchDocumentStore()
document_store.write_documents(docs)

query = "What treatments are available for chronic bronchitis?"
result = OpenSearchHybridRetriever(document_store).run(...). # add SentenceTransformersTextEmbedder with "BAAI/bge-small-en-v1.5"
print(result)

[julian-risch]

Suggested change

	You can learn more about the `OpenSearchHybridRetriever` in the [documentation]().
	You can learn more about the `OpenSearchHybridRetriever` in the [documentation](https://docs.haystack.deepset.ai/docs/opensearchhybridretriever).

[davidsbatista]

Thanks for the suggestions!

This is all mostly in "draft" mode, I want to have first the documentation done - I just opened the PR to have some feedback regarding the structure - other SuperComponents are in the docs only and not in integrations.