failed to create mappings with freezer-manage db sync

[Shangzhong Zhu]

1. install freezer-api
2. install elasticsearch 1.7 and start
3. create mappings with freezer-manage db sync

failed to create mappings, log info:
2016-10-11 15:33:27.074 17968 INFO elasticsearch [-] HEAD http://192.168.56.223:9200/ [status:200 request:0.006s]
2016-10-11 15:33:27.082 17968 WARNING elasticsearch [-] POST /freezer/_cache/clear [status:404 request:0.003s]
2016-10-11 15:33:27.084 17968 ERROR freezer_api.cmd.manage [-] string indices must be integers

After the "self.elk.indices.clear_cache(index=self.index)" was removed from the ElasticManager.__init__(in the file freezer_api.cmd.manage.py), install the freezer-api and run "freezer-manage db sync" again, it works well.

Again, add the "self.elk.indices.clear_cache(index=self.index)" to the ElasticManager.__init__, install the freezer-api and run "freezer-manage db sync" again, it works well. Likewise, run "freezer-manage db show" is OK also.