diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/10_dense_vector_basic.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/10_dense_vector_basic.yml
index 9d68a7fbbc2..668280d8a78 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/10_dense_vector_basic.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/10_dense_vector_basic.yml
@@ -10,6 +10,7 @@ setup:
         index: test-index
         body:
           settings:
+            number_of_shards: 1
             number_of_replicas: 0
           mappings:
             properties:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/15_dense_vector_l1l2.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/15_dense_vector_l1l2.yml
index 61726c4cbf7..2bf95d38793 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/15_dense_vector_l1l2.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/15_dense_vector_l1l2.yml
@@ -10,6 +10,7 @@ setup:
         index: test-index
         body:
           settings:
+            number_of_shards: 1
             number_of_replicas: 0
           mappings:
             properties:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/20_dense_vector_special_cases.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/20_dense_vector_special_cases.yml
index f323043ef71..f856c369bb4 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/20_dense_vector_special_cases.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/20_dense_vector_special_cases.yml
@@ -10,9 +10,8 @@ setup:
         index: test-index
         body:
           settings:
-            number_of_replicas: 0
-            # we need to have 1 shard to get request failure in test "Dense vectors should error with sparse vector functions"
             number_of_shards: 1
+            number_of_replicas: 0
           mappings:
             properties:
               my_dense_vector:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/30_sparse_vector_basic.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/30_sparse_vector_basic.yml
index a2f52266e9c..05ff14cb089 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/30_sparse_vector_basic.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/30_sparse_vector_basic.yml
@@ -12,6 +12,7 @@ setup:
         index: test-index
         body:
           settings:
+            number_of_shards: 1
             number_of_replicas: 0
           mappings:
             properties:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/35_sparse_vector_l1l2.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/35_sparse_vector_l1l2.yml
index 11248548d57..f06ef63e935 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/35_sparse_vector_l1l2.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/35_sparse_vector_l1l2.yml
@@ -12,6 +12,7 @@ setup:
         index: test-index
         body:
           settings:
+            number_of_shards: 1
             number_of_replicas: 0
           mappings:
             properties:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/40_sparse_vector_special_cases.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/40_sparse_vector_special_cases.yml
index 05596b76a18..3672f45e9f7 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/40_sparse_vector_special_cases.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/40_sparse_vector_special_cases.yml
@@ -12,9 +12,8 @@ setup:
         index: test-index
         body:
           settings:
-            number_of_replicas: 0
-            # we need to have 1 shard to get request failure in test "Sparse vectors should error with dense vector functions"
             number_of_shards: 1
+            number_of_replicas: 0
           mappings:
             properties:
               my_sparse_vector:
diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/50_vector_stats.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/50_vector_stats.yml
index b81ee9c5c19..96190125efd 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/50_vector_stats.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/vectors/50_vector_stats.yml
@@ -17,6 +17,9 @@ setup:
       indices.create:
         index: test-index1
         body:
+          settings:
+            number_of_shards: 1
+            number_of_replicas: 0
           mappings:
             properties:
               my_dense_vector1: