Add checks for field collapse test failure (#54831)

There were some failures on 7.x of field collapse tests,
where total hits count was less then expected.
This adds an additional test to check total hits count
before field collapse queries to understand if the problem
is with field collapsing or with simply that writes have
not been finished yet

Relates to #52416

rest-api-spec/src/main/resources/rest-api-spec/test/search/110_field_collapsing.yml

@@ -56,6 +56,11 @@ setup:
 ---
 "field collapsing":
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true
@@ -88,6 +93,11 @@ setup:
 ---
 "field collapsing and from":
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true
@@ -109,6 +119,11 @@ setup:
 ---
 "field collapsing and inner_hits":
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true
@@ -149,6 +164,11 @@ setup:
 ---
 "field collapsing, inner_hits and maxConcurrentGroupRequests":
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true
@@ -233,6 +253,11 @@ setup:
 ---
 "no hits and inner_hits":
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true
@@ -265,6 +290,10 @@ setup:
 
 ---
 "field collapsing and multiple inner_hits":
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
 
   - do:
       search:
@@ -323,6 +352,11 @@ setup:
       version: " - 6.1.0"
       reason:  "bug fixed in 6.1.1"
 
+  - do:
+      count:
+        index: test
+  - match: {count: 6}
+
   - do:
       search:
         rest_total_hits_as_int: true