Simplify implementation

exporter/elasticsearchexporter/internal/objmodel/objmodel.go

@@ -244,14 +244,6 @@ func (doc *Document) Serialize(w io.Writer, dedot bool) error {
 	return doc.iterJSON(v, dedot)
 }
 
-// MergeFrom merges the fields of anotherDoc into doc, overwriting any existing fields.
-func (doc *Document) MergeFrom(anotherDoc Document) {
-	for _, field := range anotherDoc.fields {
-		doc.Add(field.key, field.value)
-	}
-	doc.Dedup()
-}
-
 func (doc *Document) iterJSON(v *json.Visitor, dedot bool) error {
 	if dedot {
 		return doc.iterJSONDedot(v)

exporter/elasticsearchexporter/model.go

@@ -94,8 +94,10 @@ func (m *encodeModel) encodeSpan(resource pcommon.Resource, span ptrace.Span, sc
 
 func (m *encodeModel) encodeAttributes(document *objmodel.Document, attributes pcommon.Map) {
 	if m.omitAttributesPrefix {
-		rawDoc := objmodel.DocumentFromAttributes(attributes)
-		document.MergeFrom(rawDoc)
+		attributes.Range(func(k string, v pcommon.Value) bool {
+			document.AddAttribute(k, v)
+			return true
+		})
 	} else {
 		document.AddAttributes("Attributes", attributes)
 	}