Your question is a database question (Oracle Text isn't OBIEE but DB).
What sounds strange is why are you supposed to install it by hand, I don't remember having to do anything extra other than installing 11gR2 for an OBIEE 11g install. So what kind of database did you install? (detailed version)
I installed Oracle Database 11g Enterprise Edition Release 126.96.36.199.0 - 64bit
SQL*Plus: Release 188.8.131.52.0 Production on Tue Apr 4 15:36:18 2017
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Enter user-name: sys/sys as sysdba
Oracle Database 11g Enterprise Edition Release 184.108.40.206.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options