Update Existing Indexes to Work with Elasticsearch 5x

You must update existing indexes to work with Elasticsearch 5x.

Update Elasticsearch mappings with the new field for each sensor:

curl -XPUT "http://${ELASTICSEARCH_HOST}:9200/${SENSOR}_index*/_mapping/${SENSOR}_doc" -d '
 {
         "properties" : {
           "alert" : {
             "type" : "nested"
           }
         }
 }
 '
 rm ${SENSOR}.template