community: OpenSearchVectorStore: use engine set at init() time by default

[epinzur]

Description:

• Updated the OpenSearchVectorStore to use the engine parameter captured at init() time as the default when adding documents to the store.

Formatted, Linted, and Tested.

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1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **langchain** | ⬜️ Ignored ([Inspect](https://vercel.com/langchain/langchain/AdWycRR2kkYgkcStZXM7RR94sK8d)) | [Visit Preview](https://langchain-git-fork-epinzur-opensearchengine-langchain.vercel.app) | | Nov 16, 2024 1:03am |