[8.11](backport #37330) Remove event fields from error log.

libbeat/processors/script/javascript/session.go

@@ -91,7 +91,7 @@
 	// Measure load times
 	start := time.Now()
 	defer func() {
 		took := time.Now().Sub(start)
 		logger.Debugf("Load of javascript pipeline took %v", took)
 	}()
 	// Setup JS runtime.
@@ -210,7 +210,6 @@
 		if r := recover(); r != nil {
 			s.log.Errorw("The javascript processor caused an unexpected panic "+
 				"while processing an event. Recovering, but please report this.",
-				"event", mapstr.M{"original": b.Fields.String()},
 				"panic", r,
 				zap.Stack("stack"))
 			if !s.evt.IsCancelled() {
@@ -218,9 +217,9 @@
 			}
 			err = fmt.Errorf("unexpected panic in javascript processor: %v", r)
 			if s.tagOnException != "" {
 				mapstr.AddTags(b.Fields, []string{s.tagOnException})
 			}
 			appendString(b.Fields, "error.message", err.Error(), false)
 		}
 	}()
 
@@ -239,9 +238,9 @@
 
 	if _, err = s.processFunc(goja.Undefined(), s.evt.JSObject()); err != nil {
 		if s.tagOnException != "" {
 			mapstr.AddTags(b.Fields, []string{s.tagOnException})
 		}
 		appendString(b.Fields, "error.message", err.Error(), false)
 		return b, fmt.Errorf("failed in process function: %w", err)
 	}