报错信息：
Exception in thread "main" ElasticsearchStatusException[Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Invalid interval specified, must be non-null and non-empty]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Invalid interval specified, must be non-null and non-empty]];
at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:177)
at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1727)
at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1704)
at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1467)
at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424)
at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394)
at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:930)
at com.softsec.util.demoTime.main(demoTime.java:88)
Suppressed: org.elasticsearch.client.ResponseException: method [POST], host [http://192.168.101.92:9200], URI [/news/_search?typed_keys=true&ignore_unavailable=false&expand_wildcards=open&allow_no_indices=true&ignore_throttled=true&search_type=query_then_fetch&batched_reduce_size=512&ccs_minimize_roundtrips=true], status line [HTTP/1.1 400 Bad Request]
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Invalid interval specified, must be non-null and non-empty"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"news","node":"8GuMfo5aRz2CCgl49bY0aQ","reason":{"type":"illegal_argument_exception","reason":"Invalid interval specified, must be non-null and non-empty"}}],"caused_by":{"type":"illegal_argument_exception","reason":"Invalid interval specified, must be non-null and non-empty","caused_by":{"type":"illegal_argument_exception","reason":"Invalid interval specified, must be non-null and non-empty"}}},"status":400}
at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:253)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:231)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:205)
at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1454)
... 4 more报错信息解释：指定的无效时间间隔，必须为非空且非空；意思是指定的“时间间隔”出了问题；
在ES中设定时间间隔属性的是 interval
来看Demo：
加上时间间隔interval后：
查询代码：
GET /news/_search
{
"size" : 0,
"aggregations": {
"sales": {
"date_histogram": {
"field": "crawlTime",
"interval": "month",
"format": "yyyy-MM-dd"
}
}
}
}当然，间隔时间可以自定义（如下图），设置为每两天为一个单位；也可以设成N东或N秒为单位；
