The installed parsers are not lua modules, but they can be added to the package.cpath. Neovim searches for tree-sitter parsers in a parser directory on the runtimepath (:h rtp). Parsers installed with ...
You will need JDK and I won't go into how to install it here. Install Logstash, I tested it with version 6.7.2 https://www.elastic.co/downloads/past-releases/logstash ...