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Documentation Changes:
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Documentation Changes Summary:

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1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

As reported in https://github.com/langchain-ai/langchain-mongodb/issues/211, it can be easy to miss that the results are filtered by default by text_key. I think there are two things we could do while maintaining backwards compat:

Add text_key to the example as suggested by evgeniishch
Warn if no documents match the key, with the current value of text_key in the warning.

Address the usability of text_key

Make sure that existing tests pass to preserve backwards compatibility.