From 6e1ecec8f4361e8748e40d04e52b49f41e983d56 Mon Sep 17 00:00:00 2001
From: Jason Tedor <jason@tedor.me>
Date: Wed, 23 Jan 2019 07:46:52 -0500
Subject: [PATCH] Final

---
 .../org/elasticsearch/common/util/concurrent/ThreadContext.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/main/java/org/elasticsearch/common/util/concurrent/ThreadContext.java b/server/src/main/java/org/elasticsearch/common/util/concurrent/ThreadContext.java
index 155d4b9227d45..0fa0e832a0a2b 100644
--- a/server/src/main/java/org/elasticsearch/common/util/concurrent/ThreadContext.java
+++ b/server/src/main/java/org/elasticsearch/common/util/concurrent/ThreadContext.java
@@ -771,7 +771,7 @@ public AbstractRunnable unwrap() {
         }
     }
 
-    private static Collector<String, Set<String>, Set<String>> LINKED_HASH_SET_COLLECTOR = new LinkedHashSetCollector<>();
+    private static final Collector<String, Set<String>, Set<String>> LINKED_HASH_SET_COLLECTOR = new LinkedHashSetCollector<>();
 
     private static class LinkedHashSetCollector<T> implements Collector<T, Set<T>, Set<T>> {
         @Override