diff --git a/docs/changelog/85334.yaml b/docs/changelog/85334.yaml
new file mode 100644
index 0000000000000..bd4d4c0711082
--- /dev/null
+++ b/docs/changelog/85334.yaml
@@ -0,0 +1,5 @@
+pr: 85334
+summary: Do not fetch source when finding index of last state docs
+area: Machine Learning
+type: bug
+issues: []
diff --git a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence/JobResultsPersister.java b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence/JobResultsPersister.java
index 6f50555fa1c3e..77d1eaed2a636 100644
--- a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence/JobResultsPersister.java
+++ b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence/JobResultsPersister.java
@@ -341,6 +341,7 @@ private static SearchRequest buildQuantilesDocIdSearch(String quantilesDocId) {
         return new SearchRequest(AnomalyDetectorsIndex.jobStateIndexPattern()).allowPartialSearchResults(false)
             .source(
                 new SearchSourceBuilder().size(1)
+                    .fetchSource(false)
                     .trackTotalHits(false)
                     .query(new BoolQueryBuilder().filter(new IdsQueryBuilder().addIds(quantilesDocId)))
             );
diff --git a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/process/IndexingStateProcessor.java b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/process/IndexingStateProcessor.java
index aa89d2097771b..3658e900e76c7 100644
--- a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/process/IndexingStateProcessor.java
+++ b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/process/IndexingStateProcessor.java
@@ -217,6 +217,7 @@ private String getConcreteIndexOrWriteAlias(String documentId) {
         SearchRequest searchRequest = new SearchRequest(AnomalyDetectorsIndex.jobStateIndexPattern()).allowPartialSearchResults(false)
             .source(
                 new SearchSourceBuilder().size(1)
+                    .fetchSource(false)
                     .trackTotalHits(false)
                     .query(new BoolQueryBuilder().filter(new IdsQueryBuilder().addIds(documentId)))
             );