fixes JAVA-1097 deprecate ensureIndex() methods
fixes JAVA-1097 deprecate ensureIndex() methods

jsonking/mongo-java-driver,rozza/mongo-java-driver,jyemin/mongo-java-driver,rozza/mongo-java-driver,gianpaj/mongo-java-driver,jsonking/mongo-java-driver,jyemin/mongo-java-driver,kay-kim/mongo-java-driver,PSCGroup/mongo-java-driver