Elasticsearch 2.x forbidden us using dot in JSON key strings. But the compare condition of watcher configuration always use dot, like ctx.**, ctx.**.**.
It make us a confusion.
Hey,
Elasticsearch 2.x forbids to use field names that contain dots, but it still requires you to use the dot-notation to refer to inner fields. See https://www.elastic.co/guide/en/elasticsearch/reference/current/breaking_20_mapping_changes.html#_field_names_may_not_contain_dots
--Alex