Elastic 8 java client aggregations

Aggregation innerAggregation = new Aggregation.Builder()
        .terms(t -> t
                 .field("inner_field")
                 .size(10)
        )
        .build();

// Create the outer aggregation and add the inner aggregation to it
Aggregation outerAggregation = new Aggregation.Builder()
        .terms(t -> t
                 .field("outer_field")
                 .size(5)
        )
        .aggregations("inner_agg", innerAggregation)
        .aggregations("inner_agg2", innerAggregation)
        .build();