Fix full text search when search starts with a "." or end with a number

How to reproduce

• go to mobile app
• connect to https://nightly-102.nuxeo.com
• Click on search field and start typing ".png"
• nothing appears in the search(error)
• erase and type mp4
• nothing appears in the search(error)

If you go to the desktop you are able to search for ".png" and get results