Increase the threshold

Author: dnhatn

benchmarks/src/main/java/org/elasticsearch/benchmark/index/codec/tsdb/TSDBDocValuesMergeBenchmark.java

@@ -258,7 +258,7 @@ private static IndexWriterConfig createIndexWriterConfig(boolean optimizedMergeE
         );
         config.setLeafSorter(DataStream.TIMESERIES_LEAF_READERS_SORTER);
         config.setMergePolicy(new LogByteSizeMergePolicy());
-        var docValuesFormat = new ES819TSDBDocValuesFormat(4096, optimizedMergeEnabled);
+        var docValuesFormat = new ES819TSDBDocValuesFormat(4096, 512, optimizedMergeEnabled);
         config.setCodec(new Elasticsearch900Lucene101Codec() {
 
             @Override

server/src/main/java/org/elasticsearch/index/codec/tsdb/es819/ES819TSDBDocValuesFormat.java

@@ -33,6 +33,7 @@ public class ES819TSDBDocValuesFormat extends org.apache.lucene.codecs.DocValues
 
     static final int NUMERIC_BLOCK_SHIFT = 7;
     public static final int NUMERIC_BLOCK_SIZE = 1 << NUMERIC_BLOCK_SHIFT;
+    public static final int MIN_DOC_PER_ORDINAL_FOR_ORDINAL_RANGE_ENCODING = 512;
     static final int NUMERIC_BLOCK_MASK = NUMERIC_BLOCK_SIZE - 1;
     static final int DIRECT_MONOTONIC_BLOCK_SHIFT = 16;
     static final String CODEC_NAME = "ES819TSDB";
@@ -110,7 +111,7 @@ private static boolean getOptimizedMergeEnabledDefault() {
 
     /** Default constructor. */
     public ES819TSDBDocValuesFormat() {
-        this(DEFAULT_SKIP_INDEX_INTERVAL_SIZE, NUMERIC_BLOCK_SIZE, OPTIMIZED_MERGE_ENABLE_DEFAULT);
+        this(DEFAULT_SKIP_INDEX_INTERVAL_SIZE, MIN_DOC_PER_ORDINAL_FOR_ORDINAL_RANGE_ENCODING, OPTIMIZED_MERGE_ENABLE_DEFAULT);
     }
 
     /** Doc values fields format with specified skipIndexIntervalSize. */