Groovy脚本执行异常

Question

有谁能告诉我解决以下异常需要采取什么方法？

[2017-05-23 15:28:48,783][DEBUG][action.search.type       ] [Mister Buda] [2217] Failed to execute fetch phase
org.elasticsearch.script.groovy.GroovyScriptExecutionException: NullPointerException[null]
    at org.elasticsearch.script.groovy.GroovyScriptEngineService$GroovyScript.run(GroovyScriptEngineService.java:274)
    at org.elasticsearch.search.fetch.script.ScriptFieldsFetchSubPhase.hitExecute(ScriptFieldsFetchSubPhase.java:74)
    at org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:194)
    at org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:516)
    at org.elasticsearch.search.action.SearchServiceTransportAction$17.call(SearchServiceTransportAction.java:452)
    at org.elasticsearch.search.action.SearchServiceTransportAction$17.call(SearchServiceTransportAction.java:449)
    at org.elasticsearch.search.action.SearchServiceTransportAction$23.run(SearchServiceTransportAction.java:559)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

我在查询索引时看到此异常，该查询包含script_field。

我正在使用elasticsearch版本1.5。

这是剧本，

(( _source.rating.'${amount}'.costRating.value * costWeighting) + ( _source.rating.flexibilityRating.value * (1 - costWeighting))) * 10

这里是索引中样本数据的图像，