diff --git a/docs/reference/docs/reindex.asciidoc b/docs/reference/docs/reindex.asciidoc
index b085e081b4dd7..e96c262d67bb4 100644
--- a/docs/reference/docs/reindex.asciidoc
+++ b/docs/reference/docs/reindex.asciidoc
@@ -982,6 +982,10 @@ Reindex supports <<sliced-scroll>> to parallelize the reindexing process.
 This parallelization can improve efficiency and provide a convenient way to
 break the request down into smaller parts.
 
+NOTE: Reindexing from remote clusters does not support
+<<docs-reindex-manual-slice, manual>> or
+<<docs-reindex-automatic-slice, automatic slicing>>.
+
 [float]
 [[docs-reindex-manual-slice]]
 ==== Manual slicing
diff --git a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/40_ml_datafeed_crud.yml b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/40_ml_datafeed_crud.yml
index e453014258a24..4d732015d47f4 100644
--- a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/40_ml_datafeed_crud.yml
+++ b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/40_ml_datafeed_crud.yml
@@ -1,3 +1,8 @@
+setup:
+  - skip:
+      version: "all"
+      reason:  "AwaitsFix https://github.com/elastic/elasticsearch/issues/42258"
+
 ---
 "Test old cluster datafeed without aggs":
   - do:
diff --git a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/40_ml_datafeed_crud.yml b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/40_ml_datafeed_crud.yml
index 8347e09e0c17d..2a7b56adb9a16 100644
--- a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/40_ml_datafeed_crud.yml
+++ b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/40_ml_datafeed_crud.yml
@@ -1,3 +1,8 @@
+setup:
+  - skip:
+      version: "all"
+      reason:  "AwaitsFix https://github.com/elastic/elasticsearch/issues/42258"
+
 ---
 "Put job and datafeed without aggs in old cluster":
 
diff --git a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/40_ml_datafeed_crud.yml b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/40_ml_datafeed_crud.yml
index 5dc71ecb0679e..4b742e10de61f 100644
--- a/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/40_ml_datafeed_crud.yml
+++ b/x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/40_ml_datafeed_crud.yml
@@ -1,4 +1,8 @@
 setup:
+  - skip:
+      version: "all"
+      reason:  "AwaitsFix https://github.com/elastic/elasticsearch/issues/42258"
+
   - do:
      cluster.health:
         wait_for_status: green