hello:
 I have reading calcite source code about Elasticsearch adapter, when I
debug the code ,I find that the Elasticsearch adapter can not support UDF (
I wrote a UDF , and rigister it),what's more ,  the function of calcite own
support  is also Invalid ,such as lower() or concat() . What should I do?
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB