Regexp Query not works on keyword field

I mapped a field that uses the Keyword Analyzer (that uses the
one-string-tokenizer and lowercase token filter).
I indexed some big text (around 2'000 chars). I made this because I want to
percolate new documents against a big bunch of regexp queries.

But the regexp not works, it return zero results.

"query": {
"regexp": {
"my_big_text": {
"value": ".the word."

"value": ".*"
returns no results too.

Is that a bug or made I something wrong?

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