fixed inconsistent variable naming

[eschullert]

Summary

This pull request fixes an inconsistency in the vector store index configuration.

According to the documentation, the expected format for a vector store index is:

{
  "store": {
    "index": {
      "embed": "openai:text-embeddings-3-small",
      "dims": 1536,
      "fields": ["text", "summary"]
    }
  }
}

However, in the Postgres vector store implementation, the parameter was named text-fields instead of fields. This PR renames the parameter to fields to align with the documented format and maintain consistency across vector store backends.

Rationale

• Improves consistency with the documented interface.
• Reduces potential confusion and improves interoperability.

Let me know if any additional changes are needed!

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[eyurtsev]

@hinthornw could you take a look the PostgresIndexConfig seems to indicate that "text_fields" is not a thing. Is this for backwards compatibility or just a typo?

[eschullert]

Hey @eyurtsev, just checking in to see if there’s been any movement on this PR. It’s a small one, but it’s been bothering me a bit at work since I had to do a workaround to patch the inconsistency. Totally happy to make any changes if needed — just wanted to make sure it didn’t fall through the cracks!