LUCENE-7390: another part of the revert
diff --git a/lucene/core/src/java/org/apache/lucene/index/PointValuesWriter.java b/lucene/core/src/java/org/apache/lucene/index/PointValuesWriter.java
index ce7e578..dcc7600 100644
--- a/lucene/core/src/java/org/apache/lucene/index/PointValuesWriter.java
+++ b/lucene/core/src/java/org/apache/lucene/index/PointValuesWriter.java
@@ -164,6 +164,6 @@
       }
     };
 
-    writer.writeField(fieldInfo, reader, Math.max(indexWriterConfig.getRAMBufferSizeMB()/8.0));
+    writer.writeField(fieldInfo, reader);
   }
 }