Rush is an adjective too.So,it's a bit "rush" or "rushed"?

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If you need a document by a certain time, you would say "It is a bit of a rush" for example You can say something in the lines of "The dinner was a bit rushed" - "It was a bit rushed" - that is, referring to the dinner. Example: Q: How are you enjoying the dinner? A: We are enjoying it but it's a bit rushed That's just one example out of many!

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If you need a document by a certain time, you would say "It is a bit of a rush" for example
You can say something in the lines of "The dinner was a bit rushed" - "It was a bit rushed" - that is, referring to the dinner.
Example:
Q: How are you enjoying the dinner?
A: We are enjoying it but it's a bit rushed

That's just one example out of many!

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"Rush" is not and adjective!

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Which one you use depends on what you want to say.

In this case, I think the most appropriate form would be " It is a bit RUSHED".