HighLivelRestClient 分组按时间查询折线图

HighLevelRestClient is a Java-based REST client for Elasticsearch, which is a popular open-source, distributed search and analytics engine. If you want to query a line chart grouped by time, you can use the following steps:

1. Define the date range for the query: This can be done using the "gte" and "lte" parameters in the query, where "gte" stands for greater than or equal to and "lte" stands for less than or equal to.

2. Use a "date histogram" aggregation in the query: This will group the data into intervals based on the date range. For example, you can group the data into daily, weekly, or monthly intervals.

3. Return the aggregated data as a line chart: You can use the aggregated data to create a line chart, which will show the trend over time.

Here's an example of what a query using HighLevelRestClient might look like:

SearchRequest searchRequest = new SearchRequest("my_index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("timestamp")
    .gte("2021-01-01")
    .lte("2021-12-31");
searchSourceBuilder.query(rangeQueryBuilder);

DateHistogramAggregationBuilder dateHistogramAggregationBuilder = AggregationBuilders.dateHistogram("agg_name")
    .field("timestamp")
    .dateHistogramInterval(DateHistogramInterval.DAY);
searchSourceBuilder.aggregation(dateHistogramAggregationBuilder);

searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

This is just an example, and you may need to modify it based on the specifics of your data and use case.