Allow FST builder to use different writer (#12543)

lucene/core/src/java/org/apache/lucene/codecs/lucene90/blocktree/Lucene90BlockTreeTermsWriter.java

@@ -16,6 +16,8 @@
  */
 package org.apache.lucene.codecs.lucene90.blocktree;
 
+import static org.apache.lucene.util.fst.FSTCompiler.getOnHeapReaderWriter;
+
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -525,7 +527,7 @@ public void compileIndex(
               // Disable suffixes sharing for block tree index because suffixes are mostly dropped
               // from the FST index and left in the term blocks.
               .suffixRAMLimitMB(0d)
-              .bytesPageBits(pageBits)
+              .dataOutput(getOnHeapReaderWriter(pageBits))
               .build();
       // if (DEBUG) {
       //  System.out.println("  compile index for prefix=" + prefix);