public PluginDO findPluginBySelectorId(final String selectorId) {
        return Optional.ofNullable(selectorDataMap.get(selectorId))
                .flatMap(selectorDO -> Optional.ofNullable(pluginMap.get(selectorDO.getPluginId()))).orElse(null);
    }
find plugin by selector id.

@param selectorId  selectorId
@return PluginDO
shenyu-admin/src/main/java/org/apache/shenyu/admin/model/event/selector/BatchSelectorDeletedEvent.java