Upgrade to lucene 8.1.0-snapshot-e460356abe#40952

Merged

jimczi merged 6 commits intoelastic:masterfrom jimczi:upgrade/lucene_8_1_0_e460356abe

Apr 16, 2019

+69-296

Commits on Apr 8, 2019

Commits on Apr 10, 2019

iter
jimczi
committed

Commits on Apr 11, 2019

Revert elastic#33196 : the constantscore scorer does not expose the inner scorer anymore
jimczi
committed

Commits on Apr 15, 2019

Merge branch 'master' into upgrade/lucene_8_1_0_e460356abe
jimczi
committed