1 files changed, 1 insertions, 0 deletions
diff --git a/modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpClient.java b/modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpClient.java
index 959a4d7c9f..1050404563 100644
--- a/modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpClient.java
+++ b/modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpClient.java
@@ -122,6 +122,7 @@ class Netty4HttpClient implements Closeable {
             HttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, method, uriAndBody.v1(), content);
             request.headers().add(HttpHeaderNames.HOST, "localhost");
             request.headers().add(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
+            request.headers().add(HttpHeaderNames.CONTENT_TYPE, "application/json");
             requests.add(request);
         }
         return sendRequests(remoteAddress, requests);