[TEST] Fix rare OBOE in AbstractBytesReferenceTestCase

1 files changed, 1 insertions, 1 deletions

diff --git a/core/src/test/java/org/elasticsearch/common/bytes/AbstractBytesReferenceTestCase.java b/core/src/test/java/org/elasticsearch/common/bytes/AbstractBytesReferenceTestCase.java
index 9a9e2a4e61..c521314f92 100644
--- a/core/src/test/java/org/elasticsearch/common/bytes/AbstractBytesReferenceTestCase.java
+++ b/core/src/test/java/org/elasticsearch/common/bytes/AbstractBytesReferenceTestCase.java
@@ -53,7 +53,7 @@ public abstract class AbstractBytesReferenceTestCase extends ESTestCase {
         for (int i = 0; i < probes; i++) {
             int index = randomIntBetween(0, copy.length() - 1);
             assertEquals(pbr.get(index), copy.get(index));
-            index = randomIntBetween(sliceOffset, sliceOffset + sliceLength);
+            index = randomIntBetween(sliceOffset, sliceOffset + sliceLength - 1);
             assertEquals(pbr.get(index), slice.get(index - sliceOffset));
         }
     }