elasticserach error

[2014-11-30 13:25:13,787][DEBUG][action.search.type       ] [Tyr] [products_production_20141130122307375][4], node[V-7QzMAKSwOE743VhcAYWA], [P], s[STARTED]: Failed to execute [org.elasticsearch.action.search.SearchRequest@5e5f293b]
org.elasticsearch.search.SearchParseException: [products_production_20141130122307375][4]: query[ConstantScore(*:*)],from[0],size[15]: Parse Failure [Failed to parse source [{"query":{"match_all":{}},"size":15,"from":0,"sort":{"priority":"desc"},"filter":{"and":[{"term":{"company.id":77}},{"term":{"available_for_purchase":true}},{"term":{"category_name":"FONE DE OUVIDO"}}]}}]]
    at org.elasticsearch.search.SearchService.parseSource(SearchService.java:649)
    at org.elasticsearch.search.SearchService.createContext(SearchService.java:511)
    at org.elasticsearch.search.SearchService.createAndPutContext(SearchService.java:483)
    at org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:252)
    at org.elasticsearch.search.action.SearchServiceTransportAction$5.call(SearchServiceTransportAction.java:206)
    at org.elasticsearch.search.action.SearchServiceTransportAction$5.call(SearchServiceTransportAction.java:203)
    at org.elasticsearch.search.action.SearchServiceTransportAction$23.run(SearchServiceTransportAction.java:517)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.elasticsearch.search.SearchParseException: [products_production_20141130122307375][4]: query[ConstantScore(*:*)],from[0],size[15]: Parse Failure [No mapping found for [priority] in order to sort on]
    at org.elasticsearch.search.sort.SortParseElement.addSortField(SortParseElement.java:198)
    at org.elasticsearch.search.sort.SortParseElement.addCompoundSortField(SortParseElement.java:135)
    at org.elasticsearch.search.sort.SortParseElement.parse(SortParseElement.java:90)
    at org.elasticsearch.search.SearchService.parseSource(SearchService.java:633)
    ... 9 more