fix visibility (#1398)

src/aggregation/collector.rs

@@ -9,6 +9,7 @@ use crate::aggregation::agg_req_with_accessor::get_aggs_with_accessor_and_valida
 use crate::collector::{Collector, SegmentCollector};
 use crate::{SegmentReader, TantivyError};
 
+/// The default max bucket count, before the aggregation fails.
 pub const MAX_BUCKET_COUNT: u32 = 65000;
 
 /// Collector for aggregations.
@@ -22,6 +23,7 @@ pub struct AggregationCollector {
 impl AggregationCollector {
     /// Create collector from aggregation request.
     ///
+    /// Aggregation fails when the total bucket count is higher than max_bucket_count.
     /// max_bucket_count will default to `MAX_BUCKET_COUNT` (65000) when unset
     pub fn from_aggs(agg: Aggregations, max_bucket_count: Option<u32>) -> Self {
         Self {

src/aggregation/intermediate_agg_result.rs

@@ -36,10 +36,7 @@ pub struct IntermediateAggregationResults {
 
 impl IntermediateAggregationResults {
     /// Convert intermediate result and its aggregation request to the final result.
-    pub(crate) fn into_final_bucket_result(
-        self,
-        req: Aggregations,
-    ) -> crate::Result<AggregationResults> {
+    pub fn into_final_bucket_result(self, req: Aggregations) -> crate::Result<AggregationResults> {
         self.into_final_bucket_result_internal(&(req.into()))
     }
 

src/aggregation/mod.rs

@@ -166,6 +166,7 @@ use std::fmt::Display;
 
 pub use collector::{
     AggregationCollector, AggregationSegmentCollector, DistributedAggregationCollector,
+    MAX_BUCKET_COUNT,
 };
 use itertools::Itertools;
 use serde::{Deserialize, Serialize};