org.elasticsearch.common.compress.NotXContentException: Compressor detection can only be called on s

使用bulkRequest时候

new IndexRequest(indexName,indexType,indexId).source(paramMap,XContentType.JSON)

paramMap为null时会报以下错误

org.elasticsearch.common.compress.NotXContentException: Compressor detection can only be called on some xcontent bytes or compressed xcontent bytes
bulkRequest使用时候不允许paramMap为null