diff --git a/x-pack/plugins/security/server/session_management/session_index.test.ts b/x-pack/plugins/security/server/session_management/session_index.test.ts
index e1890273469ed..04991f4aeefd6 100644
--- a/x-pack/plugins/security/server/session_management/session_index.test.ts
+++ b/x-pack/plugins/security/server/session_management/session_index.test.ts
@@ -473,6 +473,7 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
+        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -555,6 +556,7 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
+        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -649,6 +651,7 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
+        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -737,6 +740,7 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
+        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -850,6 +854,7 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
+        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
diff --git a/x-pack/plugins/security/server/session_management/session_index.ts b/x-pack/plugins/security/server/session_management/session_index.ts
index 9f11e9224243c..9166ec9deb91f 100644
--- a/x-pack/plugins/security/server/session_management/session_index.ts
+++ b/x-pack/plugins/security/server/session_management/session_index.ts
@@ -857,6 +857,7 @@ export class SessionIndex {
           size: SESSION_INDEX_CLEANUP_BATCH_SIZE,
           sort: '_shard_doc',
           track_total_hits: false, // for performance
+          allow_partial_search_results: true,
         });
         const { hits } = searchResponse.hits;
         if (hits.length > 0) {