message: there is no logstash 7.1
diff: @@ -195,8 +195,7 @@ elasticimages := elasticsearch__6 \
  kibana__7 \
  kibana__7.1 \
  logstash__6 \
  - logstash__7 \
  - logstash__7.1
  + logstash__7
  build-elasticimages = $(foreach image,$(elasticimages),build/$(image))
  