This is the 2861st most frequent Japanese word.
ご存知
"ご存知" means "knowledge" or "knowing," often used politely to refer to someone's awareness or familiarity with something.
Here, 'ご存知' is used to inquire if the listener is aware or familiar with the referenced movie.
この映画をご存知ですか。
Are you familiar with this movie?
In this sentence, 'ご存知' indicates that the person had knowledge about the topic in question in the past.
彼はその問題についてご存知でした。
He was aware of the issue.
Here, 'ご存知' is employed to suggest a possibility of the listener knowing something about the mentioned author.