Check out this upgrading advice or this sticky in the Logstash subforum.
What you need to do is explicitly set document_type
in the elasticsearch
output, like this:
elasticsearch {
hosts => [ "localhost:9200" ]
index => 'fg-%{+YYYY.MM.dd}'
document_type => doc
}
This may not work for any existing indexes, as there will already be a type defined in the mapping of those indexes, but it will work for all new indexes.