presto-mongodb/src/main/java/io/prestosql/plugin/mongodb/MongoClientConfig.java/MongoClientConfig/setMinConnectionsPerHost
class MongoClientConfig:    @Config("mongodb.min-connections-per-host")
    public MongoClientConfig setMinConnectionsPerHost(int minConnectionsPerHost)
    {
        this.minConnectionsPerHost = minConnectionsPerHost;
        return this;
    }