Creating logstash config file for csv with multiple date fields

[PKA (K)]

$ curl -XGET 'http://localhost:9200/_mapping/dus'

Here is what I got when I gave the above command:
{"error":{"root_cause":[{"type":"type_missing_exception","reason":"type[[dus]] missing","index":"_all"}],"type":"type_missing_exception","reason":"type[[dus]] missing","index":"_all"},"status":404}