Fix OpenSearch username/password env fallback in examples

[fallintoplace]

Description

• Fix OpenSearch notebook examples that used bitwise OR for credential fallback.
• Replaces username | os.getenv(...) and password | os.getenv(...) with or so fallback to environment variables works correctly.
• Prevents TypeError when username/password are strings or None in:
  • examples/notebooks/beam-ml/rag_usecase/opensearch_connector.py
  • examples/notebooks/beam-ml/rag_usecase/opensearch_enrichment.py

Testing

Not run (not requested).

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a logic error in the OpenSearch connector and enrichment examples. By correcting the operator used for environment variable fallbacks, the code now correctly handles credential initialization, ensuring that the system properly defaults to environment variables when explicit parameters are not provided.

Highlights

• Bug Fix: Replaced incorrect bitwise OR operators with logical OR operators for OpenSearch credential fallback logic.
• Error Prevention: Resolved potential TypeError exceptions that occurred when attempting to use bitwise operations on string or None types.

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[gemini-code-assist]

Code Review

This pull request corrects a logical error in both opensearch_connector.py and opensearch_enrichment.py by replacing the bitwise OR operator (|) with the logical or operator when resolving username and password fallback values from environment variables. There are no review comments, so I have no feedback to provide.

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[github-actions]

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R: @kennknowles added as fallback since no labels match configuration

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