[insight-metrics] MapperParsingException[failed to parse]; nested: JsonParseException[Unexpected character (',' (code 44))

Issue

When we assign insight-metrics.elasticsearch on a container with a Broker profile, we got the following WARN on the log:

2017-02-07 09:42:25,095 | WARN  | icMetricsStorage | AbstractElasticsearchStorage     | 224 - io.fabric8.insight.insight-elasticsearch-factory - 1.2.0.redhat-630224 | Error executing request: MapperParsingException[failed to parse]; nested: JsonParseException[Unexpected character (',' (code 44)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen  |  at [Source: [B@1fc61d7; line: 37, column: 23]];