ENG-5321: Check if the elastic index exists before trying to clear.
ENG-5321: Check if the elastic index exists before trying to clear.

creative-quant/voltdb,kumarrus/voltdb,flybird119/voltdb,kumarrus/voltdb,deerwalk/voltdb,paulmartel/voltdb,ingted/voltdb,creative-quant/voltdb,VoltDB/voltdb,zuowang/voltdb,deerwalk/voltdb,flybird119/voltdb,migue/voltdb,paulmartel/voltdb,VoltDB/voltdb,kumarrus/voltdb,kumarrus/voltdb,wolffcm/voltdb,wolffcm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,wolffcm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,migue/voltdb,migue/voltdb,creative-quant/voltdb,ingted/voltdb,deerwalk/voltdb,VoltDB/voltdb,paulmartel/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,kumarrus/voltdb,flybird119/voltdb,VoltDB/voltdb,wolffcm/voltdb,creative-quant/voltdb,migue/voltdb,wolffcm/voltdb,deerwalk/voltdb,paulmartel/voltdb,flybird119/voltdb,ingted/voltdb,paulmartel/voltdb,zuowang/voltdb,VoltDB/voltdb,ingted/voltdb,zuowang/voltdb,ingted/voltdb,creative-quant/voltdb,creative-quant/voltdb,creative-quant/voltdb,wolffcm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,wolffcm/voltdb,VoltDB/voltdb,zuowang/voltdb,zuowang/voltdb,ingted/voltdb,deerwalk/voltdb,migue/voltdb,paulmartel/voltdb,creative-quant/voltdb,migue/voltdb,zuowang/voltdb,flybird119/voltdb,zuowang/voltdb,ingted/voltdb,flybird119/voltdb,zuowang/voltdb,VoltDB/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,flybird119/voltdb,kumarrus/voltdb,migue/voltdb,flybird119/voltdb,migue/voltdb,wolffcm/voltdb,ingted/voltdb