I have the 5.0.0-alpha3 setup here, sat alongside the live 2.3.3 version (on Ubuntu). There is a feeder Logstash which delivers the same data to both live and beta. On the beta, I have an error the the "limit of total fields  in index" has been exceeded.
Can anyone tell me how I set this limit? I've tried the setting "index.mapping.total_fields.limit: 2000" in the elasticsearch.yml, but this complains about an index setting in node settings.