Ensure ordering when creating double blocks

Author: carlosdelest

server/src/main/java/org/elasticsearch/index/mapper/BlockDocValuesReader.java

@@ -541,7 +541,8 @@ private static class FloatVectorValuesBlockReader extends BlockDocValuesReader {
 
         @Override
         public BlockLoader.Block read(BlockFactory factory, Docs docs) throws IOException {
-            try (BlockLoader.DoubleBuilder builder = factory.doubles(docs.count())) {
+            // Doubles from doc values ensures that the values are in order
+            try (BlockLoader.DoubleBuilder builder = factory.doublesFromDocValues(docs.count())) {
                 for (int i = 0; i < docs.count(); i++) {
                     int doc = docs.get(i);
                     if (doc < iterator.docID()) {