diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 661af0c..1c26232 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -3259,6 +3259,15 @@
 If not set or set to a zero, defaults to the number of logical CPUs as returned
 by the JVM. If set to a negative value, defaults to a direct executor.
 
+[[index.cacheQueryResultsByChangeNum]]index.cacheQueryResultsByChangeNum::
++
+Allow to cache and reuse the change JSON elements by their Change number.
+This improves the performance of queries that are returning Changes duplicates.
+It needs to be turned off when having Changes imported from other servers
+because of the potential conflicts of change numbers.
++
+Defaults to true.
+
 [[index.onlineUpgrade]]index.onlineUpgrade::
 +
 Whether to upgrade to new index schema versions while the server is
diff --git a/java/com/google/gerrit/server/change/ChangeJson.java b/java/com/google/gerrit/server/change/ChangeJson.java
index 32e40eb..02b0a60 100644
--- a/java/com/google/gerrit/server/change/ChangeJson.java
+++ b/java/com/google/gerrit/server/change/ChangeJson.java
@@ -235,6 +235,7 @@
   private final Optional<PluginDefinedInfosFactory> pluginDefinedInfosFactory;
   private final boolean includeMergeable;
   private final boolean lazyLoad;
+  private final boolean cacheQueryResultsByChangeNum;
 
   private AccountLoader accountLoader;
   private FixInput fix;
@@ -274,6 +275,8 @@
     this.includeMergeable = MergeabilityComputationBehavior.fromConfig(cfg).includeInApi();
     this.lazyLoad = containsAnyOf(this.options, REQUIRE_LAZY_LOAD);
     this.pluginDefinedInfosFactory = pluginDefinedInfosFactory;
+    this.cacheQueryResultsByChangeNum =
+        cfg.getBoolean("index", "cacheQueryResultsByChangeNum", true);
 
     logger.atFine().log("options = %s", options);
   }
@@ -496,7 +499,7 @@
         // This problem has two sides where 'last in the list' has to be respected:
         // (1) Caching
         // (2) Reusing
-        boolean isCacheable = i != changes.size() - 1;
+        boolean isCacheable = cacheQueryResultsByChangeNum && (i != changes.size() - 1);
         ChangeData cd = changes.get(i);
         ChangeInfo info = cache.get(cd.getId());
         if (info != null && isCacheable) {