From b5ad3148358cea4f24abaacadbc9a4ae03f1b7c7 Mon Sep 17 00:00:00 2001
From: Adrien Grand <jpountz@gmail.com>
Date: Wed, 20 Dec 2017 12:48:04 +0100
Subject: [PATCH] LUCENE-8077: Fixed wrong modulo usage in CheckIndex.

---
 lucene/CHANGES.txt                                           | 5 +++++
 lucene/core/src/java/org/apache/lucene/index/CheckIndex.java | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lucene/CHANGES.txt b/lucene/CHANGES.txt
index d8e1237b7c9..98cdcd9eeb9 100644
--- a/lucene/CHANGES.txt
+++ b/lucene/CHANGES.txt
@@ -94,6 +94,11 @@ Improvements
 
 * LUCENE-8093: TrimFilterFactory implements MultiTermAwareComponent (Alan Woodward)
 
+Bug Fixes
+
+* LUCENE-8077: Fixed bug in how CheckIndex verifies doc-value iterators.
+  (Xiaoshan Sun via Adrien Grand)
+
 ======================= Lucene 7.2.0 =======================
 
 API Changes
diff --git a/lucene/core/src/java/org/apache/lucene/index/CheckIndex.java b/lucene/core/src/java/org/apache/lucene/index/CheckIndex.java
index 028da241fb3..c676568b69f 100644
--- a/lucene/core/src/java/org/apache/lucene/index/CheckIndex.java
+++ b/lucene/core/src/java/org/apache/lucene/index/CheckIndex.java
@@ -2195,7 +2195,7 @@ public final class CheckIndex implements Closeable {
           throw new RuntimeException("dv iterator field=" + field + ": doc=" + (doc-1) + " has unstable advanceExact");
         }
 
-        if (i % 1 == 0) {
+        if (i % 2 == 0) {
           int doc2 = it2.nextDoc();
           if (doc != doc2) {
             throw new RuntimeException("dv iterator field=" + field + ": doc=" + doc + " was not found through advance() (got: " + doc2 + ")");