Fix some tests for the rerank operator.

Author: afoucret

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/inference/RerankOperator.java

@@ -169,9 +169,7 @@ public Page buildOutput() {
 
             @Override
             public void close() {
-                inputPage.allowPassingToDifferentDriver();
-                inputPage.releaseBlocks();
-
+                releasePageOnAnyThread(inputPage);
                 Releasables.closeExpectNoException(scoreBlockBuilder);
             }
 

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/inference/RerankOperatorTests.java

@@ -71,7 +71,7 @@ private void initChannels() {
         scoreChannel = between(0, channelCount - 1);
         inputChannelElementTypes = IntStream.range(0, channelCount).sorted().mapToObj(this::randomElementType).collect(Collectors.toList());
         rowEncoderFactory = mockRowEncoderFactory();
-        encodedRowLength = between(1, 10);
+        encodedRowLength = between(1, 20);
     }
 
     @Before
@@ -236,7 +236,7 @@ private XContentRowEncoder.Factory mockRowEncoderFactory() {
             XContentRowEncoder rowEncoder = mock(XContentRowEncoder.class);
             doAnswer(encoderInvocation -> {
                 Page inputPage = encoderInvocation.getArgument(0, Page.class);
-                BytesRef scratch = new BytesRef(randomRealisticUnicodeOfCodepointLength(encodedRowLength));
+                BytesRef scratch = new BytesRef(randomAlphanumericOfLength(encodedRowLength));
                 return driverContext.blockFactory().newConstantBytesRefBlockWith(scratch, inputPage.getPositionCount());
             }).when(rowEncoder).eval(any(Page.class));