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java.lang.NullPointerException: null	at org.codelibs.fess.suggest.util.SuggestUtil.getAsList(SuggestUtil.java:186)	at org.codelibs.fess.suggest.request.popularwords.PopularWordsRequest.createResponse(PopularWordsRequest.java:187)	at org.codelibs.fess.suggest.request.popularwords.PopularWordsRequest$1.onResponse(PopularWordsRequest.java:109)	at org.codelibs.fess.suggest.request.popularwords.PopularWordsRequest$1.onResponse(PopularWordsRequest.java:103)	at org.elasticsearch.action.support.ThreadedActionListener$1.doRun(ThreadedActionListener.java:89)	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)