Some people with bad character sometimes encounter the problem of the above picture: When you want to use Spotlight to find something, it always tells you that it is busy indexing, and does not give an expected completion time at all. This time you have to think about whether something is wrong with it, you can try to fix it by using a method that deletes all existing indexes:
Log on with a user with administrator privileges, open terminal, and enter the following line to turn off indexing work:
sudo mdutil-i off/
Follow the on-screen prompts to enter the current administrator password to confirm. Next Enter:
sudo mdutil-e/
This line of command deletes/removes all Spotlight indexed content, and then restarts/starts with the following line command.
sudo mdutil-i on/
Wait for a while, in general, the possibility of indexing problems will be relatively small.