We allow users to close the create index dialog while creating the index is still in progress because it can take a while and we don't want to force users to stay on this form. Once the user pressed the “Cancel” button or closed the modal with X, keep an "In progress…" pillow while the process is not finished, and either remove it as soon as the index is successfully created or replace it with a "Failed" pillow in case of error. Since several indexes can be created one by one and have "In progress…" pillows, we won't be able to reopen the modal with an error. We add on hover tooltip for the "Failed" pillow so users have an access to the error message. Users can remove failed indexes from the indexes table. The in-progress indexes can not be removed manually.