ELASTICSEARCH_INDEX_PREFIX not working

[red-coder]

Brownian can not find the meta index when configuring ELASTICSEARCH_INDEX_PREFIX to something else than "bro". This can be fixed by changing getIndices() to use the prefix.

Current code:

#Brownian/view/utils/es.py
def getIndices():
    result = Request(index="@bro-meta")._doRequest({"size": 65535})
...

Fixed code:

#Brownian/view/utils/es.py
def getIndices():
    result = Request(index="@{}-meta".format(settings.ELASTICSEARCH_INDEX_PREFIX))._doRequest({"size": 65535})
...