Red Hat Bugzilla – 1570943 – OSP10->11->12 undercloud upgrade fails with: ERROR keystone DbMigrationError: (pymysql.err.InternalError) (1061, u"Duplicate key name 'ix_default_project_id'") [SQL: u'CREATE INDEX ix_default_project_id ON user (default_project_id)']
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:1599