Update elasticsearch from 5.3.0 to 5.4.0 (#2489)

requirements/common.txt

@@ -157,7 +157,9 @@ pylibmc==1.5.2 \
 
 django-pylibmc==0.6.1 --hash=sha256:9cffdee703aaf9ebc029d9dbdee8abdd0723564b95e4b2ac59e4a668b8e58f93
 
-elasticsearch==5.3.0 --hash=sha256:aea16d6d6ad03a509c9f591eee9ce4ce62918d8ba26bf6513097223929be0a09
+elasticsearch==5.4.0 \
+    --hash=sha256:8f02d626cff98befd298ffb1d19d8e519643d86d3aa27f6d7388566ec4ba48ee \
+    --hash=sha256:e754c688e20fe73160fb6f7f5b63f2a71c78788dc9e6908950681d3a39b56e85
 elasticsearch-dsl==5.2.0 --hash=sha256:1a816fed5a0b9cbc862670f3455aa151e75f6042db38a1b008f73cc12173e0d0
 
 # required by elasticsearch