You started tasks, and they are running as you can see on "http://localhost:8080/#/indexing" but they are not completing.
There are two possible causes:
If you see a progress of less than 100%, please wait.
If the progress is 100%, an error has occurred, and the tasks failed to complete, which may be caused by various reasons. If you're an advanced user, you can create an issue on Datashare Github with the application logs.