Java 为什么Spring Data MongoDB不提供；提示“；用于聚合操作的选项，mongodb驱动程序有，但我没有'；我不知道如何使用它

我经常使用MongoTemplate进行聚合操作，但效率不高。我想“提示”指定我自己的索引以提高性能

但是，不能在AggregationOptions中添加“提示”选项

我看到DBCollection可能能够做到这一点，但我没有找到一种方法来做到这一点。AggregateOperation不是DBCollection的聚合方法中的参数，AggregateOperation是我能找到的唯一可以使用“提示”的地方

1.org.springframework.data.mongodb.core.aggregation.AggregationOption可用参数：

public AggregationOptions(boolean allowDiskUse, boolean explain, @Nullable Document cursor,
            @Nullable Collation collation) {

        this.allowDiskUse = allowDiskUse;
        this.explain = explain;
        this.cursor = Optional.ofNullable(cursor);
        this.collation = Optional.ofNullable(collation);
    }

AggregationOptions(AggregationOptions.Builder builder) {
        this.batchSize = builder.batchSize;
        this.allowDiskUse = builder.allowDiskUse;
        this.outputMode = builder.outputMode;
        this.maxTimeMS = builder.maxTimeMS;
        this.bypassDocumentValidation = builder.bypassDocumentValidation;
        this.collation = builder.collation;
    }

2.com.mongodb.AggregationOptions可用参数：

public AggregationOptions(boolean allowDiskUse, boolean explain, @Nullable Document cursor,
            @Nullable Collation collation) {

        this.allowDiskUse = allowDiskUse;
        this.explain = explain;
        this.cursor = Optional.ofNullable(cursor);
        this.collation = Optional.ofNullable(collation);
    }

AggregationOptions(AggregationOptions.Builder builder) {
        this.batchSize = builder.batchSize;
        this.allowDiskUse = builder.allowDiskUse;
        this.outputMode = builder.outputMode;
        this.maxTimeMS = builder.maxTimeMS;
        this.bypassDocumentValidation = builder.bypassDocumentValidation;
        this.collation = builder.collation;
    }

我只是想通过索引提高查询的效率。查询速度太慢。一个复杂的查询需要20秒。简单查询也需要4~5s

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英语不是很好，如果你表达不清楚，请原谅。

聚合选项中的提示是最近实施的[SpringDataMongoDB 3.1版]，你可以像这样使用它

    Aggregation
      .newAggregation(aggrgationOperations)
      .withOptions(AggregationOptions.builder().hint(new Document("fieldName", 1)).build()

或者，对于地理空间查询，只需将索引更改为位置字段，如下所示：

AggregationOptions.builder().hint(new Document("fieldName", "2dsphere").build();

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2020年同样的问题