Pinecone - add methods to close resources

[anakin87]

Related Issues

• draft for bug: Unclosed aiohttp Sessions When Using PineconeDocumentStore with run_async #1634

Proposed Changes:

• I am implementing close and close_async to close resources when the Document Store is no longer needed. Discussed in Document Store - closing resources #1628 (comment)

How did you test it?

CI

Test script

import asyncio
import random

from haystack_integrations.document_stores.pinecone.document_store import PineconeDocumentStore

namespaces = [
    "test_comparison_greater_than_equal_with_dataframe-1736932566",
    "test_comparison_greater_than_equal_with_string-1729243732",
    "test_comparison_greater_than_equal-1729243731",
    "test_comparison_greater_than_with_dataframe-1736932562",
    "test_comparison_in-1729158147",
    "test_comparison_less_than_with_dataframe-1729243742",
    "test_comparison_less_than_with_string-1729243740",
]

ds = PineconeDocumentStore(
    index="default",
    namespace=namespaces[0],
)
print(ds.count_documents())

async def test_namespace(namespace):
    ds = PineconeDocumentStore(index="default", namespace=namespace)
    try:
        await ds.filter_documents_async()
        num_documents = await ds.count_documents_async()
        print(f"Namespace {namespace}: {num_documents} documents")

        documents = await ds._embedding_retrieval_async(query_embedding=[0.1] * 768)

        if documents:
            print(f"First document: {documents[0]}")

    finally:
        # commenting the following line causes "Unclosed connector" errors
        await ds.close_async()

async def main():
    tasks = [
        test_namespace(random.choice(namespaces))
        for _ in range(5)
    ]
    await asyncio.gather(*tasks)

asyncio.run(main())

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.