What version of Heartbeat are you using? The docs you linked to are for 5.6. Probably you are running 6.0 so see https://www.elastic.co/guide/en/beats/libbeat/6.0/breaking-changes-6.0.html#breaking-changes-import-dashboards.

---
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB