Searching using a partial string is not working

If you are using Solr as a backend, you probably just need to pick a different type than “Fulltext”. E.g., “Fulltext "edge"” sounds promising. Switch the field type, reindex and then try again.
In general, it is expected that only complete words might be found, depending on your configuration. This is dependent on the backend used.
If you are not using Solr, please tell me which backend you are using.

Thanks @drunken monkey. That worked, I used Fulltext "edge". Could we add a description to this datatype so that someone knows, something like:
This data type represents a search field that enables partial word matching. It allows users to find results containing the specified keyword or substring within a larger text

Right now it says: Custom full text field.

Right, that makes sense. Changing issue properties accordingly and moving to the correct queue.