diff --git a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReader.java b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReader.java
index 04cd4a62..7e574dbe 100644
--- a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReader.java
+++ b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReader.java
@@ -35,7 +35,7 @@ public interface IndexJournalReader extends Iterable<IndexJournalReadEntry> {
                         | WordFlags.SiteAdjacent.asBit();
 
         return new IndexJournalReaderSingleCompressedFile(path, null,
-                r -> (r.metadata() & highPriorityFlags) != 0);
+                r -> (r & highPriorityFlags) != 0);
     }
 
     void forEachWordId(LongConsumer consumer);
@@ -48,6 +48,12 @@ public interface IndexJournalReader extends Iterable<IndexJournalReadEntry> {
     @Override
     Iterator<IndexJournalReadEntry> iterator();
 
+    boolean filter(IndexJournalReadEntry entry);
+
+    boolean filter(IndexJournalReadEntry entry, IndexJournalEntryData.Record record);
+
+    boolean filter(IndexJournalReadEntry entry, long metadata);
+
     void close() throws IOException;
 
 
diff --git a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderPagingImpl.java b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderPagingImpl.java
index 24bf02db..8a80753d 100644
--- a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderPagingImpl.java
+++ b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderPagingImpl.java
@@ -52,6 +52,21 @@ public class IndexJournalReaderPagingImpl implements IndexJournalReader {
         return Iterators.concat(readers.stream().map(IndexJournalReader::iterator).iterator());
     }
 
+    @Override
+    public boolean filter(IndexJournalReadEntry entry) {
+        return readers.get(0).filter(entry);
+    }
+
+    @Override
+    public boolean filter(IndexJournalReadEntry entry, IndexJournalEntryData.Record record) {
+        return readers.get(0).filter(entry, record);
+    }
+
+    @Override
+    public boolean filter(IndexJournalReadEntry entry, long metadata) {
+        return readers.get(0).filter(entry, metadata);
+    }
+
     @Override
     public void close() throws IOException {
         for (var reader : readers) {
diff --git a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderSingleCompressedFile.java b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderSingleCompressedFile.java
index 04352880..27739274 100644
--- a/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderSingleCompressedFile.java
+++ b/code/features-index/index-journal/src/main/java/nu.marginalia.index/journal/reader/IndexJournalReaderSingleCompressedFile.java
@@ -4,17 +4,13 @@ import com.github.luben.zstd.ZstdInputStream;
 import lombok.SneakyThrows;
 import nu.marginalia.index.journal.model.IndexJournalEntryData;
 import nu.marginalia.index.journal.model.IndexJournalFileHeader;
-import nu.marginalia.index.journal.model.IndexJournalStatistics;
 import org.jetbrains.annotations.NotNull;
-import org.roaringbitmap.longlong.Roaring64Bitmap;
 
 import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
-import java.util.Arrays;
 import java.util.Iterator;
-import java.util.function.IntConsumer;
 import java.util.function.LongConsumer;
 import java.util.function.Predicate;
 
@@ -31,23 +27,23 @@ public class IndexJournalReaderSingleCompressedFile implements IndexJournalReade
     private DataInputStream dataInputStream = null;
 
     final Predicate<IndexJournalReadEntry> entryPredicate;
-    final Predicate<IndexJournalEntryData.Record> recordPredicate;
+    final Predicate<Long> metadataPredicate;
 
     public IndexJournalReaderSingleCompressedFile(Path file) throws IOException {
         this.journalFile = file;
 
         fileHeader = readHeader(file);
 
-        this.recordPredicate = null;
+        this.metadataPredicate = null;
         this.entryPredicate = null;
     }
 
-    public IndexJournalReaderSingleCompressedFile(Path file, Predicate<IndexJournalReadEntry> entryPredicate, Predicate<IndexJournalEntryData.Record> recordPredicate) throws IOException {
+    public IndexJournalReaderSingleCompressedFile(Path file, Predicate<IndexJournalReadEntry> entryPredicate, Predicate<Long> metadataPredicate) throws IOException {
         this.journalFile = file;
 
         fileHeader = readHeader(file);
 
-        this.recordPredicate = recordPredicate;
+        this.metadataPredicate = metadataPredicate;
         this.entryPredicate = entryPredicate;
     }
 
@@ -69,13 +65,21 @@ public class IndexJournalReaderSingleCompressedFile implements IndexJournalReade
         return new DataInputStream(new ZstdInputStream(new BufferedInputStream(fileInputStream)));
     }
 
+    @Override
     public boolean filter(IndexJournalReadEntry entry) {
         return entryPredicate == null || entryPredicate.test(entry);
     }
 
+    @Override
     public boolean filter(IndexJournalReadEntry entry, IndexJournalEntryData.Record record) {
         return (entryPredicate == null || entryPredicate.test(entry))
-            && (recordPredicate == null || recordPredicate.test(record));
+            && (metadataPredicate == null || metadataPredicate.test(record.metadata()));
+    }
+
+    @Override
+    public boolean filter(IndexJournalReadEntry entry, long metadata) {
+        return (entryPredicate == null || entryPredicate.test(entry))
+                && (metadataPredicate == null || metadataPredicate.test(metadata));
     }
 
     public void close() throws IOException {
@@ -129,19 +133,35 @@ public class IndexJournalReaderSingleCompressedFile implements IndexJournalReade
     }
 
     private class JournalEntryIterator implements Iterator<IndexJournalReadEntry> {
-        private int i = 0;
+        private int i = -1;
+        private IndexJournalReadEntry next;
 
         @Override
         @SneakyThrows
         public boolean hasNext() {
-            return i < fileHeader.fileSize();
+            if (next != null)
+                return true;
+
+            while (++i < fileHeader.fileSize()) {
+                var entry = IndexJournalReadEntry.read(dataInputStream);
+                if (filter(entry)) {
+                    next = entry;
+                    return true;
+                }
+            }
+
+            return false;
         }
 
         @SneakyThrows
         @Override
         public IndexJournalReadEntry next() {
-            i++;
-            return IndexJournalReadEntry.read(dataInputStream);
+            if (hasNext()) {
+                var ret = next;
+                next = null;
+                return ret;
+            }
+            throw new IllegalStateException();
         }
 
     }
diff --git a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindex.java b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindex.java
index 52ba642b..9d992968 100644
--- a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindex.java
+++ b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindex.java
@@ -115,7 +115,7 @@ public class ReversePreindex {
 
         Path docsFile = Files.createTempFile(destDir, "docs", ".dat");
 
-        LongArray mergedDocuments = LongArray.mmapForWriting(docsFile, 8 * (left.documents.size() + right.documents.size()));
+        LongArray mergedDocuments = LongArray.mmapForWriting(docsFile, 2 * (left.documents.size() + right.documents.size()));
 
         leftIter.next();
         rightIter.next();
diff --git a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexDocuments.java b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexDocuments.java
index c51a977d..537b45df 100644
--- a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexDocuments.java
+++ b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexDocuments.java
@@ -40,7 +40,7 @@ public class ReversePreindexDocuments {
         logger.info("Transferring data");
         createUnsortedDocsFile(docsFile, reader, segments, docIdRewriter);
 
-        LongArray docsFileMap = LongArray.mmapForWriting(docsFile, 8 * Files.size(docsFile));
+        LongArray docsFileMap = LongArray.mmapForModifying(docsFile);
         logger.info("Sorting data");
         sortDocsFile(docsFileMap, segments);
 
@@ -64,7 +64,7 @@ public class ReversePreindexDocuments {
                                                IndexJournalReader reader,
                                                ReversePreindexWordSegments segments,
                                                DocIdRewriter docIdRewriter) throws IOException {
-        long fileSize = 8 * segments.totalSize();
+        long fileSize = RECORD_SIZE_LONGS * segments.totalSize();
         LongArray outArray = LongArray.mmapForWriting(docsFile, fileSize);
 
         var offsetMap = segments.asMap(RECORD_SIZE_LONGS);
@@ -78,6 +78,10 @@ public class ReversePreindexDocuments {
                 long wordId = data.get(i);
                 long meta = data.get(i+1);
 
+                if (!reader.filter(entry, meta)) {
+                    continue;
+                }
+
                 long offset = offsetMap.addTo(wordId, RECORD_SIZE_LONGS);
 
                 outArray.set(offset + 0, rankEncodedId);
diff --git a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexWordSegments.java b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexWordSegments.java
index 5acd2219..c2820e46 100644
--- a/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexWordSegments.java
+++ b/code/features-index/index-reverse/src/main/java/nu/marginalia/index/construction/ReversePreindexWordSegments.java
@@ -67,8 +67,7 @@ public class ReversePreindexWordSegments {
         int i = 0;
         LongIterator iter = countsMap.keySet().iterator();
         while (iter.hasNext()) {
-            words.set(i, iter.nextLong());
-            i++;
+            words.set(i++, iter.nextLong());
         }
 
         // Sort the words file