Searching and Retrieving Information Protocol For Solr

[Furkan KAMACI]

There is a low level protocol that defines client–server protocol for
searching and retrieving information from remote computer databases called
as Z39.50. Due to Solr is a commonly used search engine (beside being a
NoSQL database) is there any protocol for (I don't mean a low level
protocol, z39.50 is just an example) Solr that it can integrate with other
clients or anything else?