speling error
Merge pull request #1436 from marcel-blonk/PLFM-2882

delayed initialization for search services
Merge pull request #1442 from marcel-blonk/PLFM-2909

Make error message more helpful
Merge pull request #1443 from marcel-blonk/PLFM-2891

use counting semaphore for user throttling
Merge pull request #1444 from marcel-blonk/PLFM-2848

make search worker retry on failure