smile error

gistfile1.txt

org.elasticsearch.search.builder.SearchSourceBuilderException: Failed to build search source
        at org.elasticsearch.search.builder.SearchSourceBuilder.buildAsUnsafeBytes(SearchSourceBuilder.java:399)
        at org.elasticsearch.action.search.SearchRequest.source(SearchRequest.java:259)
        at org.elasticsearch.client.action.search.SearchRequestBuilder.doExecute(SearchRequestBuilder.java:582)
        at org.elasticsearch.client.action.support.BaseRequestBuilder.execute(BaseRequestBuilder.java:56)
        at org.elasticsearch.client.action.support.BaseRequestBuilder.execute(BaseRequestBuilder.java:51)
        at de.jetwick.es.ElasticTweetSearch.query(ElasticTweetSearch.java:239)
        at de.jetwick.es.ElasticTweetSearch.query(ElasticTweetSearch.java:228)
        at de.jetwick.es.ElasticTweetSearch.search(ElasticTweetSearch.java:243)
        at de.jetwick.es.ElasticTweetSearch.findDuplicates(ElasticTweetSearch.java:341)
        at de.jetwick.es.ElasticTweetSearch.update(ElasticTweetSearch.java:304)
        at de.jetwick.es.ElasticTweetSearch$1.run(ElasticTweetSearch.java:469)
Caused by: java.lang.IllegalArgumentException: Unmatched second part of surrogate pair (0xdf88)
        at org.elasticsearch.common.jackson.smile.SmileGenerator._throwIllegalSurrogate(SmileGenerator.java:1720)
        at org.elasticsearch.common.jackson.smile.SmileGenerator._shortUTF8Encode2(SmileGenerator.java:1539)
        at org.elasticsearch.common.jackson.smile.SmileGenerator._shortUTF8Encode(SmileGenerator.java:1500)
        at org.elasticsearch.common.jackson.smile.SmileGenerator.writeString(SmileGenerator.java:867)
        at org.elasticsearch.common.xcontent.json.JsonXContentGenerator.writeString(JsonXContentGenerator.java:74)
        at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:891)
        at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:685)
        at org.elasticsearch.index.query.xcontent.TermsQueryBuilder.doXContent(TermsQueryBuilder.java:147)
        at org.elasticsearch.index.query.xcontent.BaseQueryBuilder.toXContent(BaseQueryBuilder.java:65)
        at org.elasticsearch.index.query.xcontent.FilteredQueryBuilder.doXContent(FilteredQueryBuilder.java:62)
        at org.elasticsearch.index.query.xcontent.BaseQueryBuilder.toXContent(BaseQueryBuilder.java:65)
        at org.elasticsearch.search.builder.SearchSourceBuilder.toXContent(SearchSourceBuilder.java:433)
        at org.elasticsearch.search.builder.SearchSourceBuilder.buildAsUnsafeBytes(SearchSourceBuilder.java:396)
        ... 10 more