httplog - reduce duplication to shrink log message size

The request and response bodies are included twice in request tracer messages.
The body appears in both the event.original and http.{request,response}.body.content.
This removes the body from the event.original. It should help reduce the log message
sizes for large responses.

x-pack/filebeat/input/internal/httplog/roundtripper.go

@@ -65,15 +65,15 @@ type LoggingRoundTripper struct {
 //	http.request.body.content
 //	http.request.body.bytes
 //	http.request.mime_type
-//	event.original (the full request and body from httputil.DumpRequestOut)
+//	event.original (the request without body from httputil.DumpRequestOut)
 //
 // Fields logged in responses:
 //
 //	http.response.status_code
 //	http.response.body.content
 //	http.response.body.bytes
 //	http.response.mime_type
-//	event.original (the full response and body from httputil.DumpResponse)
+//	event.original (the response without body from httputil.DumpResponse)
 func (rt *LoggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 	// Create a child logger for this request.
 	log := rt.logger.With(
@@ -111,7 +111,7 @@ func (rt *LoggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, err
 			zap.String("http.request.mime_type", req.Header.Get("Content-Type")),
 		)
 	}
-	message, err := httputil.DumpRequestOut(req, true)
+	message, err := httputil.DumpRequestOut(req, false)
 	if err != nil {
 		errorsMessages = append(errorsMessages, fmt.Sprintf("failed to dump request: %s", err))
 	} else {
@@ -149,7 +149,7 @@ func (rt *LoggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, err
 			zap.String("http.response.mime_type", resp.Header.Get("Content-Type")),
 		)
 	}
-	message, err = httputil.DumpResponse(resp, true)
+	message, err = httputil.DumpResponse(resp, false)
 	if err != nil {
 		errorsMessages = append(errorsMessages, fmt.Sprintf("failed to dump response: %s", err))
 	} else {