Get salt pillars from a specific grain

logstash_fwder.conf

{% set instance_type = grains.get('instance_type', '') %}

{% set logstash_servers = salt['pillar.get'](instance_type + ':logstash_servers')  %}
{% set logstash_paths = salt['pillar.get'](instance_type + ':logstash_paths')  %}
{% set logstash_fields = salt['pillar.get'](instance_type + ':logstash_fields')  %}

{% if logstash_servers and logstash_paths and logstash_fields %}
{
  "network": {
    "servers": {{ logstash_servers|json }}
    , "ssl ca": "/etc/pki/tls/certs/logstash.crt"
  }
  , "files": [
    {
      "paths": {{ logstash_paths|json }}
      , "fields": {{ logstash_fields|json }}
    }
  ]
}{% endif %}