Added multithreaded index tests
Added multithreaded index tests

AllisonWang/peloton,AngLi-Leon/peloton,jessesleeping/iso_peloton,eric-haibin-lin/peloton-1,wangziqi2016/peloton,wangziqi2016/peloton,haojin2/peloton,phisiart/peloton-p3,apavlo/peloton,AllisonWang/peloton,jessesleeping/iso_peloton,eric-haibin-lin/peloton-1,haojin2/peloton,cmu-db/peloton,AllisonWang/peloton,yingjunwu/peloton,cmu-db/peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,PauloAmora/peloton,jessesleeping/iso_peloton,malin1993ml/peloton,ShuxinLin/peloton,vittvolt/peloton,wangziqi2016/peloton,malin1993ml/peloton,malin1993ml/peloton,prashasthip/peloton,PauloAmora/peloton,AllisonWang/peloton,ShuxinLin/peloton,vittvolt/peloton,vittvolt/peloton,AngLi-Leon/peloton,seojungmin/peloton,apavlo/peloton,PauloAmora/peloton,phisiart/peloton-p3,AngLi-Leon/peloton,phisiart/peloton-p3,wangziqi2016/peloton,haojin2/peloton,haojin2/peloton,vittvolt/15721-peloton,PauloAmora/peloton,cmu-db/peloton,cmu-db/peloton,ShuxinLin/peloton,eric-haibin-lin/peloton-1,prashasthip/peloton,ShuxinLin/peloton,jessesleeping/iso_peloton,ShuxinLin/peloton,AngLi-Leon/peloton,prashasthip/peloton,haojin2/peloton,seojungmin/peloton,yingjunwu/peloton,wangziqi2016/peloton,vittvolt/peloton,vittvolt/15721-peloton,prashasthip/peloton,seojungmin/peloton,vittvolt/peloton,ShuxinLin/peloton,yingjunwu/peloton,cmu-db/peloton,apavlo/peloton,prashasthip/peloton,prashasthip/peloton,malin1993ml/peloton,phisiart/peloton-p3,yingjunwu/peloton,yingjunwu/peloton,jessesleeping/iso_peloton,PauloAmora/peloton,phisiart/peloton-p3,apavlo/peloton,jessesleeping/iso_peloton,seojungmin/peloton,phisiart/peloton-p3,AngLi-Leon/peloton,wangziqi2016/peloton,apavlo/peloton,vittvolt/15721-peloton,seojungmin/peloton,seojungmin/peloton,AngLi-Leon/peloton,PauloAmora/peloton,apavlo/peloton,vittvolt/peloton,haojin2/peloton,eric-haibin-lin/peloton-1,AllisonWang/peloton,malin1993ml/peloton,yingjunwu/peloton,malin1993ml/peloton,cmu-db/peloton,vittvolt/15721-peloton,jessesleeping/iso_peloton,AllisonWang/peloton,eric-haibin-lin/peloton-1,vittvolt/15721-peloton