Ex: "Acquired" is a keyword.
This keyword is getting for every minute.
I have to get alert if this keyword is not getting generated for more than 10 min.
Your phrasing is unclear. Add a comment and explain it with many more words/sentences.
Run the following search every 5-10 minutes. Set it to trigger an alert if the result count is equal to zero.
index=foo "Acquired" earliest=-10m@m