Csv filter column names not appearing as fields in the logstash index

csv { columns => [ "A","B","C" ] separator => "," remove_field => ["message"] }

I want to then create a Line Chart with A timestamp on X axis and B value on Y axis.

However, these fields are not available for selection in the Visualise tab.
Refreshing index hasn't helped

elasticsearch 2.1.1, logstash-2.1.1, kibana-4.3.1,

issue was elasticdump was running and clobbering my index