https://www.dropwizard.io/en/release-1.3.x/
https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-7.3.2.htmlion
https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java/3.9.1
https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j/2.11.1
https://spark.apache.org/downloads.html
https://www.scala-lang.org/download/2.11.12.html
https://yum.postgresql.org/repopackages.php#pg12
https://archive.cloudera.com/cdh5/redhat/7/x86_64/cdh/5.8.0/RPMS/x86_64/