process to check public index for cache thumbnail

[kimpham54]

Jeff will come up with route for delete thumbnail - Fernando suggesting worker process to detach us -> best thing to do is a service to check to delete thumbnails

[kimpham54]

automatic file checker to make sure cache exists in the index

[kimpham54]

replaces delete thumbnail route idea, maybe check weekly

[jrynhart]

Checks the public index for a record that corresponds to each item in the cache, and deletes the cache item if the index document is not present

Tests the DuraCloud object url (head request) and removes the cache item if the object is not available