introduce new method to indicate whether the data can be read from ge…

…ojson

x-pack/plugins/maps/public/classes/fields/field.ts

@@ -26,7 +26,12 @@ export interface IField {
   // then styling properties that require the domain to be known cannot use this property.
   supportsAutoDomain(): boolean;
 
+  // Determinse wheter Maps-app can automatically deterime the domain of the field-values
+  // _without_ having to retrieve the data as GeoJson
+  // e.g. for ES-sources, this would use the extended_stats API
   supportsFieldMeta(): boolean;
+
+  canReadFromGeoJson(): boolean;
 }
 
 export class AbstractField implements IField {
@@ -90,4 +95,8 @@ export class AbstractField implements IField {
   supportsAutoDomain(): boolean {
     return true;
   }
+
+  canReadFromGeoJson(): boolean {
+    return true;
+  }
 }

x-pack/plugins/maps/public/classes/fields/mvt_field.ts

@@ -56,4 +56,8 @@ export class MVTField extends AbstractField implements IField {
   supportsAutoDomain() {
     return false;
   }
+
+  canReadFromGeoJson(): boolean {
+    return false;
+  }
 }

x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx

@@ -195,7 +195,7 @@ export class DynamicStyleProperty<T> extends AbstractStyleProperty<T>
   }
 
   supportsMbFeatureState() {
-    return this._field && this._field.supportsAutoDomain();
+    return this._field && this._field.canReadFromGeoJson();
   }
 
   getFieldMetaOptions() {