[Docs] Search returns results for non-matching queries

[Sbragul26]

Current State

When using the search bar, unrelated results are shown for random keywords. This can confuse users and reduce search accuracy.

For example:

• Searching abcde shows multiple documentation pages that are not related.

Desired State

• If a keyword does not match any content, the search should display: No results found
• The search results should only show relevant matches.

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