diff --git a/src/main/java/org/springframework/data/elasticsearch/client/reactive/WebClientProvider.java b/src/main/java/org/springframework/data/elasticsearch/client/reactive/WebClientProvider.java
index 4f448b3c3..1252f00e4 100644
--- a/src/main/java/org/springframework/data/elasticsearch/client/reactive/WebClientProvider.java
+++ b/src/main/java/org/springframework/data/elasticsearch/client/reactive/WebClientProvider.java
@@ -256,6 +256,15 @@ public interface WebClientProvider {
 							HttpHeaders suppliedHeaders = clientConfiguration.getHeadersSupplier().get();
 
 							if (suppliedHeaders != null && suppliedHeaders != HttpHeaders.EMPTY) {
+
+								// remove content-type and accept if they are provided by the client configuration (ES7 compatibility headers)
+								if (suppliedHeaders.containsKey(HttpHeaders.CONTENT_TYPE)) {
+									httpHeaders.remove(HttpHeaders.CONTENT_TYPE);
+								}
+								if (suppliedHeaders.containsKey(HttpHeaders.ACCEPT)) {
+									httpHeaders.remove(HttpHeaders.ACCEPT);
+								}
+
 								httpHeaders.addAll(suppliedHeaders);
 							}
 						}));