How do you search collections in a domain class?

[kevintanhongann]

def filter = {
            nested {
                path('permissions')
                query {
                    bool {
                        must {
                            term("permissions.authority": 'Admin')
                        }
                    }
                }
            }
        }
        def results = elasticSearchService.search(keyword, filter,[indices: Company, types: Company, from: 0, size: 10])

And I got this stacktrace

java.lang.reflect.InvocationTargetException: null
        at org.grails.core.DefaultGrailsControllerClass$ReflectionInvoker.invoke(DefaultGrailsControllerClass.java:211)
        at org.grails.core.DefaultGrailsControllerClass.invoke(DefaultGrailsControllerClass.java:188)
        at org.grails.web.mapping.mvc.UrlMappingsInfoHandlerAdapter.handle(UrlMappingsInfoHandlerAdapter.groovy:90)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
        at org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:77)
        at org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Array elements must be defined with the "element" method call eg: element(value)
        at grails.plugins.elasticsearch.util.GXContentBuilder.invokeMethod(GXContentBuilder.groovy:120)
        at haulage.project.SearchService$_searchCompanyByHaulier_closure6$_closure13.doCall(SearchService.groovy:102)
        at grails.plugins.elasticsearch.util.GXContentBuilder.handleClosureNode(GXContentBuilder.groovy:166)
        at grails.plugins.elasticsearch.util.GXContentBuilder.invokeMethod(GXContentBuilder.groovy:117)
        at haulage.project.SearchService$_searchCompanyByHaulier_closure6.doCall(SearchService.groovy:101)
        at grails.plugins.elasticsearch.util.GXContentBuilder.buildRoot(GXContentBuilder.groovy:72)
        at grails.plugins.elasticsearch.util.GXContentBuilder.build(GXContentBuilder.groovy:45)
        at grails.plugins.elasticsearch.util.GXContentBuilder.buildAsBytes(GXContentBuilder.groovy:61)
        at grails.plugins.elasticsearch.util.GXContentBuilder.buildAsBytes(GXContentBuilder.groovy:56)
        at grails.plugins.elasticsearch.ElasticSearchService.setFilterInSource(ElasticSearchService.groovy:433)
        at grails.plugins.elasticsearch.ElasticSearchService.buildSearchRequest(ElasticSearchService.groovy:371)
        at grails.plugins.elasticsearch.ElasticSearchService.search(ElasticSearchService.groovy:116)
        at haulage.project.SearchService.searchCompanyByHaulier(SearchService.groovy:112)
        at haulage.project.SearchController.haulierCompany(SearchController.groovy:247)
        ... 14 common frames omitted

How do I define the element method call? Any pointers?