Changes made to the content of Content Type containing ezuser field (User for example) are not committed to Solr.

Steps to reproduce
1. Clean installation of eZ Platorm with Solr as a search engine.
2. Create a new user:

3. Edit previously created user. Change "First name" to "Bob", press "Update".
4. Search for "Bob".

Result

Sorry, no results were found for "Bob".

Additional info: Searching for term "John" will display "Bob Doe" in search results.