The following bug has been logged on the website:
Bug reference: 14158
Logged by: Zhou Digoal
Email address: digoal(at)126(dot)com
PostgreSQL version: 9.6beta1
Operating system: CentOS 6.x x64
Description:
master=# create extension bloom;
CREATE EXTENSION ^
master=# create unlogged table tbl12(id int);
CREATE TABLE
master=# \set VERBOSITY verbose
master=# create index idx1 on tbl12 using bloom (id);
ERROR: XX000: index "idx1" already contains data
LOCATION: blbuildempty, blinsert.c:164