try fix travis by fixing ES version
try fix travis by fixing ES version

OpenGazettes/aleph,OpenGazettes/aleph,gazeti/aleph,pudo/aleph,alephdata/aleph,alephdata/aleph,alephdata/aleph,alephdata/aleph,smmbllsm/aleph,gazeti/aleph,pudo/aleph,gazeti/aleph,smmbllsm/aleph,alephdata/aleph,OpenGazettes/aleph,smmbllsm/aleph,gazeti/aleph,OpenGazettes/aleph,pudo/aleph