Recently the elasticsearch schema was updated to include a
build_short_uuid field which has indexed the first 7 chars of the
build_uuid. This field is useful because it allows e-r to filter on that
field instead of searching on build_uuid.
Update e-r to filter on build_short_uuid which should make queries much
more performant. As part of this change replace variables named
short_build_uuid with build_short_uuid for consistency with the
elasticsearch schema.
Change-Id: Iae5323f3f5d2fd01f2c69f78b9403baf5ebafe85
fea4d1f7ee