title: com.google.api.gax.rpc.UnavailableException: io.grpc.StatusRuntimeException: UNAVAILABLE: Credentials failed to obtain metadata :cloud speech
body: <p>i've done a speech to text configuration using google's cloud speech api in java,
  this works on other machine but the same setup does not work on my machine.
  i've installed google cloud platform tools from eclipse market place also i've set the environment credential variable for run time.
  can anyone please help ?</p>