Learn to rank

Hi,

i am using elastic search 6.5.4 and now i want to use learn to rank
and installing the plugin of learn to rank
"./bin/elasticsearch-plugin install http://es-learn-to-rank.labs.o19s.com/ltr-1.1.0-es6.8.0.zip" & ltr-1.1.0-es6.4.1.zip also

anyone have idea which version i should use for LTR

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