Rename the "Search Index File" setting to "Search Index Directory".
Rename the "Search Index File" setting to "Search Index Directory".

The "Search Index File" really needs a directory instead of a filename.
Changing the label is easy. Under the hood, the data is still stored in
"search_index_file". At some point, we may want to rename this.

1tush/reviewboard,1tush/reviewboard,Khan/reviewboard,1tush/reviewboard,davidt/reviewboard,reviewboard/reviewboard,bkochendorfer/reviewboard,Khan/reviewboard,beol/reviewboard,bkochendorfer/reviewboard,chipx86/reviewboard,1tush/reviewboard,custode/reviewboard,brennie/reviewboard,1tush/reviewboard,chazy/reviewboard,atagar/ReviewBoard,chipx86/reviewboard,reviewboard/reviewboard,bkochendorfer/reviewboard,Khan/reviewboard,KnowNo/reviewboard,sgallagher/reviewboard,Khan/reviewboard,bkochendorfer/reviewboard,Khan/reviewboard,1tush/reviewboard,brennie/reviewboard,chazy/reviewboard,1tush/reviewboard,KnowNo/reviewboard,chazy/reviewboard,chazy/reviewboard,chazy/reviewboard,Khan/reviewboard,brennie/reviewboard,reviewboard/reviewboard,reviewboard/reviewboard,chazy/reviewboard,atagar/ReviewBoard,beol/reviewboard,davidt/reviewboard,atagar/ReviewBoard,davidt/reviewboard,KnowNo/reviewboard,davidt/reviewboard,chazy/reviewboard,custode/reviewboard,sgallagher/reviewboard,custode/reviewboard,Khan/reviewboard,custode/reviewboard,atagar/ReviewBoard,sgallagher/reviewboard,atagar/ReviewBoard,Khan/reviewboard,Khan/reviewboard,atagar/ReviewBoard,sgallagher/reviewboard,atagar/ReviewBoard,KnowNo/reviewboard,1tush/reviewboard,atagar/ReviewBoard,1tush/reviewboard,beol/reviewboard,brennie/reviewboard,chazy/reviewboard,chazy/reviewboard,chipx86/reviewboard,chipx86/reviewboard,atagar/ReviewBoard,beol/reviewboard