SERVER-41823 Wait for prepare to be majority committed before committing in index_builds_ignore_prepare_conflicts.js

1 files changed, 4 insertions, 0 deletions

diff --git a/jstests/noPassthrough/index_builds_ignore_prepare_conflicts.js b/jstests/noPassthrough/index_builds_ignore_prepare_conflicts.js
index 817bdf5901c..f5a0a64eea6 100644
--- a/jstests/noPassthrough/index_builds_ignore_prepare_conflicts.js
+++ b/jstests/noPassthrough/index_builds_ignore_prepare_conflicts.js
@@ -90,6 +90,10 @@
             assert.eq(undefined, op.prepareReadConflicts);
         });
 
+        // Because prepare uses w:1, ensure it is majority committed before committing the
+        // transaction.
+        PrepareHelpers.awaitMajorityCommitted(replSetTest, prepareTimestamp);
+
         // Commit the transaction before completing the index build, releasing locks which will
         // allow the index build to complete.
         assert.commandWorked(PrepareHelpers.commitTransaction(session, prepareTimestamp));