From 335f7c218728ff9cc92f413c348cb3627ff9cab9 Mon Sep 17 00:00:00 2001
From: Houston Putman <houston@apache.org>
Date: Tue, 21 Apr 2026 11:56:18 -0700
Subject: [PATCH] SOLR-18083: GetSegmentData should work in read-only mode as
 well

---
 .../org/apache/solr/handler/admin/api/GetSegmentData.java     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/solr/core/src/java/org/apache/solr/handler/admin/api/GetSegmentData.java b/solr/core/src/java/org/apache/solr/handler/admin/api/GetSegmentData.java
index fb11371c6e81..2d949b571b6c 100644
--- a/solr/core/src/java/org/apache/solr/handler/admin/api/GetSegmentData.java
+++ b/solr/core/src/java/org/apache/solr/handler/admin/api/GetSegmentData.java
@@ -153,7 +153,7 @@ public GetSegmentDataResponse getSegmentData(
       coreSummary.indexDir = core.getIndexDir();
       coreSummary.sizeInGB = (double) core.getIndexSize() / GB;
 
-      RefCounted<IndexWriter> iwRef = core.getSolrCoreState().getIndexWriter(core);
+      RefCounted<IndexWriter> iwRef = core.getSolrCoreState().getIndexWriter(core, false);
       if (iwRef != null) {
         try {
           IndexWriter iw = iwRef.get();
@@ -257,7 +257,7 @@ private Map<String, Object> getMergeInformation(
       SolrQueryRequest req, SegmentInfos infos, List<String> mergeCandidates) throws IOException {
     final var result = new HashMap<String, Object>();
     RefCounted<IndexWriter> refCounted =
-        req.getCore().getSolrCoreState().getIndexWriter(req.getCore());
+        req.getCore().getSolrCoreState().getIndexWriter(req.getCore(), false);
     try {
       IndexWriter indexWriter = refCounted.get();
       if (indexWriter instanceof SolrIndexWriter) {