[Entity Store v2] Update docs to comply with OpenAPI Specification (OAS)

.buildkite/scripts/steps/checks/capture_oas_snapshot.sh

@@ -21,7 +21,8 @@ cmd="node scripts/capture_oas_snapshot\
   --include-path /api/saved_objects/_export \
   --include-path /api/maintenance_window \
   --include-path /api/agent_builder \
-  --include-path /api/workflows"
+  --include-path /api/workflows \
+  --include-path /api/security/entity_store"
 
 run_check() {
   eval "$cmd"

.buildkite/scripts/steps/code_generation/security_solution_codegen.sh

@@ -21,4 +21,7 @@ echo -e "\n[Security Solution OpenAPI Code Generation] Endpoint Exceptions Commo
 echo -e "\n[Security Solution OpenAPI Code Generation] Security Solution Plugin\n"
 (cd x-pack/solutions/security/plugins/security_solution && yarn openapi:generate)
 
-check_for_changed_files "yarn openapi:generate" true
+echo -e "\n[Security Solution OpenAPI Code Generation] Entity Store Plugin\n"
+(cd x-pack/solutions/security/plugins/entity_store && yarn openapi:generate)
+
+check_for_changed_files "yarn openapi:generate" true