localdb\v11.0 does not support full-text index. I installed MS SQL Server 2012 express with Advanced Services , and it worked like a charm. I had to create a completely new database, although this was not a big problem for me, as I just copied all the DDL statements from the previous database. I also had to use '.\SQLEXPRESS' instead of '(LocalDb)\v11.0' as the server name.
During installation, if you want to save disk space, install only Full-Text and Semantic Extractions for Search and leave all other functions unchecked.
EDIT: You can use your old databse. Copy the old database files to a new location, preferably something like C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA and run the following sql statement.
CREATE DATABASE databaseName ON (FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA\filename.mdf'),
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