Don't set mappings for a particular index, use index templates just like Logstash does. Index templates sets a template with e.g. mappings that's applied to all newly created indexes whose name matches a particular pattern. Again, copy the original Logstash file (e.g. /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-elasticsearch-1.0.5-java/lib/logstash/outputs/elasticsearch/elasticsearch-template.json) and use it as a starting point.
The error message at the end means what it says; a given field can't have different mappings for different types in the same index. You may have to reindex to fix this. Or, since you have daily indexes, maybe the problem will be gone tomorrow.