diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICache.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICache.java
index fdf93cf43e1..80867a3fa3a 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICache.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICache.java
@@ -118,7 +118,9 @@ public class IndexedDISICache implements Accountable {
     this.name = "";
   }
 
-  // Used to represent no caching.
+  /**
+   * Shared between all structures that are too small to meaningfully use jump-tables.
+   */
   public static final IndexedDISICache EMPTY = new IndexedDISICache();
 
   /**
@@ -156,6 +158,10 @@ public class IndexedDISICache implements Accountable {
        return target >> RANK_BLOCK_BITS << RANK_BLOCK_BITS;
   }
 
+  /**
+   * Offsets stated the block starts.
+   * @return true if the cache has offsets.
+   */
   public boolean hasOffsets() {
     return blockCache != null;
   }
@@ -299,6 +305,7 @@ public class IndexedDISICache implements Accountable {
   }
 
   /**
+   * Creation stats intended for human inspection.
    * @return Human readable details from the creation of the cache instance.
    */
   public String getCreationStats() {
@@ -306,6 +313,7 @@ public class IndexedDISICache implements Accountable {
   }
 
   /**
+   * Cache name, as stated in the constructor.
    * @return Human-readable name for the cache instance.
    */
   public String getName() {
diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICacheFactory.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICacheFactory.java
index 610529abf6f..f177210c17c 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICacheFactory.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/IndexedDISICacheFactory.java
@@ -47,6 +47,12 @@ public class IndexedDISICacheFactory implements Accountable {
   // jump-table for numerics with variable bits per value (dates, longs...)
   private final Map<String, VaryingBPVJumpTable> vBPVPool = new HashMap<>();
 
+  /**
+   * Creates a {@link IndexedDISICache} and {@link VaryingBPVJumpTable} holding factory,
+   * intended for shared use within a single segment.
+   */
+  public IndexedDISICacheFactory() { }
+
   /**
    * Create a cached {@link IndexedDISI} instance.
    * @param data   persistent data containing the DISI-structure.
@@ -146,13 +152,24 @@ public class IndexedDISICacheFactory implements Accountable {
     return cache;
   }
 
-  // Statistics
+  /**
+   * Cache statistics intended for external inspection.
+   * @return the number of total blocks where jumps are accelerated by jump-tables.
+   */
   public long getDISIBlocksWithOffsetsCount() {
     return disiPool.values().stream().filter(IndexedDISICache::hasOffsets).count();
   }
+  /**
+   * Cache statistics intended for external inspection.
+   * @return the total number of DENSE blocks where index-counts are accelerated by rank.
+   */
   public long getDISIBlocksWithRankCount() {
     return disiPool.values().stream().filter(IndexedDISICache::hasRank).count();
   }
+  /**
+   * Cache statistics intended for external inspection.
+   * @return the number of numeric blocks where jumps are accelerated by jump-tables
+   */
   public long getVaryingBPVCount() {
     return vBPVPool.size();
   }
diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/LongCompressor.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/LongCompressor.java
index 1c030a7887b..7b12cc67935 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/lucene70/LongCompressor.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/lucene70/LongCompressor.java
@@ -47,6 +47,11 @@ public class LongCompressor {
    */
   private static final double DEFAULT_MIN_ZERO_VALUES_FRACTION_FOR_SPARSE = 0.2; // 20% (just guessing of a value here)
 
+  /**
+   * LongCompressor exclusively uses static methods and is never instantiated.
+   */
+  private LongCompressor() { }
+
   /**
    * Create a compact version of the given values.
    * @param values PackedInts with no special constraints.
@@ -63,7 +68,7 @@ public class LongCompressor {
    * @return a compact version of the given values or the given values if compression did not improve on heap overhead.
    */
   public static PackedInts.Reader compress(PackedInts.Reader values, int length) {
-    return compress(values, values.size(), true);
+    return compress(values, length, true);
   }
 
   /**