Mds_Stores some times used 100% of CPU

Hi, some times mds-stores jump the processe to100% of CPU,  and I must close it with the Activity Monitor, because is the only way to kill the processes , by it self doesn't stop running (today 3 hours still working) .
What is mds_stores ? And how I can fix it, otherwise used the Activity Monitor.
MacOs 10.9.1
Thanks

That means that Spotlight is indexing your Harddrive.
To switch off the indexing open a Terminal window and type:
sudo mdutil -a -i off
NB: You will be prompted to enter your admin password.
If you change your mind about Spotlight, and decide to give it  another try, then it’s just as easy to switch back on as it was to  switch off.
Again, in a terminal window type the following:
sudo mdutil -a -i on
NB: You will be prompted to enter your admin password.

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