Fix set site settings in swagger_ui so it function correctly.

Prior to this fix, the swagger ui for applying site settings was not working.

Author: ianwallen

services/src/main/java/org/fao/geonet/api/site/SiteApi.java

@@ -27,6 +27,7 @@
 import co.elastic.clients.elasticsearch.core.CountResponse;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.ExampleObject;
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
@@ -387,11 +388,29 @@ public List<Setting> getSettingsDetails(
 
     @io.swagger.v3.oas.annotations.Operation(
         summary = "Save settings",
-        description = "")
-    @RequestMapping(
+        description = "Save the provided settings.",
+        requestBody = @io.swagger.v3.oas.annotations.parameters.RequestBody(
+            description = "Map of settings to be saved",
+            required = true,
+            content = @Content(
+                mediaType = MediaType.APPLICATION_FORM_URLENCODED_VALUE,
+                schema = @Schema(implementation = Map.class),
+                examples = {
+                    @ExampleObject(
+                        name = "Example setting",
+                        value = "{\n  \"additionalProp1\": \"string\",\n  \"additionalProp2\": \"string\",\n  \"additionalProp3\": \"string\"\n}"
+                    ),
+                    @ExampleObject(
+                        name = "Example setting selection manager max records to 1000",
+                        value = "{\n  \"system/selectionmanager/maxrecords\": \"1000\"\n}"
+                    )
+                }
+            )
+        )
+    )
+    @PostMapping(
         path = "/settings",
-        produces = MediaType.APPLICATION_JSON_VALUE,
-        method = RequestMethod.POST
+        consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE
     )
     @PreAuthorize("hasAuthority('Administrator')")
     @ResponseStatus(HttpStatus.NO_CONTENT)
@@ -400,9 +419,11 @@ public List<Setting> getSettingsDetails(
         @ApiResponse(responseCode = "403", description = ApiParams.API_RESPONSE_NOT_ALLOWED_ONLY_ADMIN)
     })
     public void saveSettings(
-        @Parameter(hidden = false)
-        @RequestParam
-        Map<String, String> allRequestParams,
+        // Mark parameter as hidden in open api specificatin as the Operation requestBody will describe the format to be supplied
+        //    Without this fix, the swagger ui will fail to work correctly.
+        @Parameter(description = "Map of settings to be saved", required = true, hidden = true)
+        @RequestParam 
+        Map<String,String> allRequestParams,
         HttpServletRequest request
     ) throws Exception {
         ApplicationContext applicationContext = ApplicationContextHolder.get();