Spotlight
Turn on indexing the startup disk: You can use OnyX to authorize or prevent the indexing of the startup disk with Spotlight.
Delete Existing Index: After indexing is turned off, you can delete the Spotlight index created previously.
Hide Icon/Show Icon: You can choose to hide or show Spotlight's icon in the menu bar. This does not affect the indexing itself. Hiding the icon also turns off the Spotlight search keyboard shortcut.
Note: To hide or show Spotlight's icon in the menu bar, System Integrity Protection must be turned off.