Fix equals/hashcode of IOContext (#13204)

lucene/CHANGES.txt

@@ -66,6 +66,8 @@ Bug Fixes
 
 * GITHUB#13169: Fix potential race condition in DocumentsWriter & DocumentsWriterDeleteQueue (Ben Trent)
 
+* GITHUB#13204: Fix euals/hashCode of IOContext. (Uwe Schindler, Robert Muir)
+
 Other
 ---------------------
 

lucene/core/src/java/org/apache/lucene/store/IOContext.java

@@ -16,6 +16,8 @@
  */
 package org.apache.lucene.store;
 
+import java.util.Objects;
+
 /**
  * IOContext holds additional details on the merge/search context. A IOContext object can never be
  * initialized as null as passed as a parameter to either {@link
@@ -118,13 +120,7 @@ public IOContext(IOContext ctxt, boolean readOnce) {
 
   @Override
   public int hashCode() {
-    final int prime = 31;
-    int result = 1;
-    result = prime * result + ((context == null) ? 0 : context.hashCode());
-    result = prime * result + ((flushInfo == null) ? 0 : flushInfo.hashCode());
-    result = prime * result + ((mergeInfo == null) ? 0 : mergeInfo.hashCode());
-    result = prime * result + (readOnce ? 1231 : 1237);
-    return result;
+    return Objects.hash(context, flushInfo, mergeInfo, readOnce, load);
   }
 
   @Override
@@ -134,13 +130,10 @@ public boolean equals(Object obj) {
     if (getClass() != obj.getClass()) return false;
     IOContext other = (IOContext) obj;
     if (context != other.context) return false;
-    if (flushInfo == null) {
-      if (other.flushInfo != null) return false;
-    } else if (!flushInfo.equals(other.flushInfo)) return false;
-    if (mergeInfo == null) {
-      if (other.mergeInfo != null) return false;
-    } else if (!mergeInfo.equals(other.mergeInfo)) return false;
+    if (!Objects.equals(flushInfo, other.flushInfo)) return false;
+    if (!Objects.equals(mergeInfo, other.mergeInfo)) return false;
     if (readOnce != other.readOnce) return false;
+    if (load != other.load) return false;
     return true;
   }