Currently if you add a field in the fields parameter with a wildcard, no fields will be added to the hits layer. The situation is even worst if the wildcard matches the field name of the geo_point or geo_shape field, in that case a ClassCastException is thrown.
x-pack/plugin/vector-tile/src/main/java/org/elasticsearch/xpack/vectortile/rest/RestVectorTileAction.java
}
                    ensureOpen();
                    final InternalGeoBounds bounds = searchResponse.getAggregations() != null
                        ? searchResponse.getAggregations().get(BOUNDS_FIELD)
                        : null;
                    final Aggregations aggsWithoutGridAndBounds = searchResponse.getAggregations() == null
                        ? null
                        : new Aggregations(
                            searchResponse.getAggregations()
                                .asList()
                                .stream()
                                .filter(a -> GRID_FIELD.equals(a.getName()) == false && BOUNDS_FIELD.equals(a.getName()) == false)
                                .collect(Collectors.toList())
                        );
                    final SearchResponse meta = new SearchResponse(
                        new SearchResponseSections(
                            new SearchHits(
                                SearchHits.EMPTY,
                                searchResponse.getHits().getTotalHits(),
                                searchResponse.getHits().getMaxScore()
                            ), 
                            aggsWithoutGridAndBounds,
                            searchResponse.getSuggest(),
                            searchResponse.isTimedOut(),
                            searchResponse.isTerminatedEarly(),
                            searchResponse.getProfileResults() == null
                                ? null
                                : new SearchProfileResults(searchResponse.getProfileResults()),
                            searchResponse.getNumReducePhases()
                        ),