(index) Fix partial buffer writing in PrioDocIdsTransformer

Ensure all data is written to writeChannel by looping until the buffer is fully drained. This prevents potential data loss during the close operation and maintains data integrity.

code/index/index-reverse/java/nu/marginalia/index/construction/prio/PrioDocIdsTransformer.java

@@ -142,8 +142,10 @@ public class PrioDocIdsTransformer implements LongArrayTransformations.LongIOTra
     @Override
     public void close() throws IOException {
         writeBuffer.flip();
+        while (writeBuffer.hasRemaining()) {
             int written = writeChannel.write(writeBuffer, writeOffsetB);
             writeOffsetB += written;
+        }
         writeBuffer.clear();
     }
 }