When calling api/reindex endpoint to reindex Elasticsearch, this will fail if another source (e.g. second clowder instance) creates index between the deletion and recreation of index by endpoint.

reindex function should catch such errors and proceed happily even if index was created elsewhere.

https://opensource.ncsa.illinois.edu/bitbucket/projects/CATS/repos/clowder/browse/app/services/ElasticsearchPlugin.scala#215