Smaller estimate

Author: Tim-Brooks

server/src/main/java/org/elasticsearch/ingest/ESONFlat.java

@@ -73,7 +73,7 @@ public BytesReference getSerializedKeyBytes() {
             try (RecyclerBytesStreamOutput streamOutput = new RecyclerBytesStreamOutput(new Recycler<>() {
 
                 // TODO: Better estimate
-                final int estimate = Math.max((int) (values.data().length() * 0.7), 512);
+                final int estimate = 512;
 
                 @Override
                 public V<BytesRef> obtain() {