Log message.openstack_roles field is not correctly anlayzed

[Swann Croiset]

Log

primary-controller, primary-elasticsearch_kibana,primary-influxdb_grafana,primary-infrastructure_alerting

Run this quey to reproduce:
curl -XGET 'http://<ES-VIP>:9200/log-*/_search?pretty' -d '
{
        "aggregations": {
                "roles" : {
                        "terms" : { "field" : "openstack_roles" }
                }
        }

}'

Actual result:

... [snip]
 "buckets" : [ {
        "key" : "primary",
        "doc_count" : 2112206
      }, {
        "key" : "controller",
        "doc_count" : 2045353
      }, {
        "key" : "elasticsearch_kibana",
        "doc_count" : 73325
      }, {
        "key" : "influxdb_grafana",
        "doc_count" : 66853
      }, {
        "key" : "infrastructure_alerting",
        "doc_count" : 66853
      }, {
        "key" : "cinder",
        "doc_count" : 11649
      }, {
        "key" : "compute",
        "doc_count" : 11649

Expected Result:

.. [snip]
  "aggregations" : {
    "roles" : {
      "doc_count_error_upper_bound" : 0,
      "sum_other_doc_count" : 0,
      "buckets" : [ {
        "key" : "primary-controller",
        "doc_count" : 7401
      }, {
        "key" : "primary-elasticsearch_kibana",
        "doc_count" : 411
      }, {
        "key" : "primary-influxdb_grafana",
        "doc_count" : 411
      }, {
        "key" : "primary-infrastructure_alerting",
        "doc_count" : 411
      }, {
        "key" : "cinder",
        "doc_count" : 41
      }, {
        "key" : "compute",
        "doc_count" : 41
      }, {
        "key" : "elasticsearch_kibana",
        "doc_count" : 31
      } ]
    }

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/275117

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/275117
Committed: https://git.openstack.org/cgit/openstack/fuel-plugin-elasticsearch-kibana/commit/?id=dfc153fe483701ffafa0ad3cba0b33b4f03e1ad3
Submitter: Jenkins
Branch: master

commit dfc153fe483701ffafa0ad3cba0b33b4f03e1ad3
Author: Swann Croiset <email address hidden>
Date: Tue Feb 2 11:50:03 2016 +0100

    Correctly analyze openstack_roles field

    Fixes-bug: #1540852

    Change-Id: If3bc9ba1fc3311c0b99e77403ab0a7ef15b62fb0