How can I search for results in Mongo DB documents using an associative array key. Something like:

SELECT * FROM table WHERE keyword like '%searchterm%';

Here is the basic document structure

[id] => 31605
[keywords] => Array (
    [keyword1] => Array (
        [name] => KeyWord1
    )
    [keyword2] => Array (
        [name] => KeyWord2
    )
    ...
)

I would like to do a search within the keywords array on the associative array key [keyword1, keyword2].

The issue is that the name key holds the case-sensitive version of the keyword and the array key is the lower-case keyword name. I could store the lowercase keyword twice, but that seems silly.