index.max_result_window

index.max_result_window是Elasticsearch中的一个参数，它控制了一个查询最多能返回的结果数。默认情况下，它的值是10000，也就是说，如果一个查询的结果数超过了10000，那么Elasticsearch会返回一个错误。这个参数的值可以通过修改elasticsearch.yml文件来进行调整。但是需要注意的是，如果将它的值设置得太大，可能会导致Elasticsearch的性能下降。

相关问题

Elasticsearch exception [type=illegal_argument_exception, reason=Result window is too large, from + size must be less than or equal to: [10000] but was [20720]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.]

您遇到了一个Elasticsearch的异常，该异常是`illegal_argument_exception`，原因是结果窗口过大。具体来说，`from + size`的值必须小于等于10000，但您设置的值为20720。Elasticsearch建议使用滚动API来更有效地请求大数据集。此限制可以通过更改`index.max_result_window`索引级别设置来进行调整。

Elasticsearch exception [type=illegal_argument_exception, reason=Result window is too large, from + size must be less than or equal to: [10000] but was [10100]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.] java代码es解决方法

这个问题是由于您请求的结果窗口超过了Elasticsearch的默认限制导致的。解决方法是使用滚动API来请求大数据集，而不是一次性获取所有结果。

下面是使用滚动API来解决这个问题的Java代码示例：

import org.elasticsearch.action.search.ClearScrollRequest;
import org.elasticsearch.action.search.ClearScrollResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchScrollRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.Scroll;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;

public class ElasticsearchScrollExample {
    private static final String INDEX_NAME = "your_index_name";
    private static final int BATCH_SIZE = 1000;

    public void scrollSearch(RestHighLevelClient client) throws IOException {
        // 创建初始搜索请求
        SearchRequest searchRequest = new SearchRequest(INDEX_NAME);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        searchSourceBuilder.size(BATCH_SIZE);
        searchRequest.source(searchSourceBuilder);
        searchRequest.scroll(TimeValue.timeValueMinutes(1L));

        // 执行搜索请求
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        String scrollId = searchResponse.getScrollId();
        SearchHit[] searchHits = searchResponse.getHits().getHits();

        while (searchHits != null && searchHits.length > 0) {
            // 处理搜索结果
            for (SearchHit hit : searchHits) {
                // 处理每个搜索结果
            }

            // 创建滚动请求
            SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
            scrollRequest.scroll(TimeValue.timeValueMinutes(1L));

            // 执行滚动请求
            searchResponse = client.scroll(scrollRequest, RequestOptions.DEFAULT);
            scrollId = searchResponse.getScrollId();
            searchHits = searchResponse.getHits().getHits();
        }

        // 清除滚动上下文
        ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
        clearScrollRequest.addScrollId(scrollId);
        ClearScrollResponse clearScrollResponse = client.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);
        boolean succeeded = clearScrollResponse.isSucceeded();
    }
}

以上代码使用了Elasticsearch的Java高级客户端来执行滚动搜索。您需要将`your_index_name`替换为您要搜索的索引名称，并根据需要调整`BATCH_SIZE`来设置每次获取的结果数量。