cleanup top level exports (#2382)

remove some top level exports

examples/custom_collector.rs

@@ -11,9 +11,10 @@ use columnar::Column;
 // ---
 // Importing tantivy...
 use tantivy::collector::{Collector, SegmentCollector};
+use tantivy::index::SegmentReader;
 use tantivy::query::QueryParser;
 use tantivy::schema::{Schema, FAST, INDEXED, TEXT};
-use tantivy::{doc, Index, IndexWriter, Score, SegmentReader};
+use tantivy::{doc, Index, IndexWriter, Score};
 
 #[derive(Default)]
 struct Stats {

examples/date_time_field.rs

@@ -13,7 +13,7 @@ fn main() -> tantivy::Result<()> {
     let opts = DateOptions::from(INDEXED)
         .set_stored()
         .set_fast()
-        .set_precision(tantivy::DateTimePrecision::Seconds);
+        .set_precision(tantivy::schema::DateTimePrecision::Seconds);
     // Add `occurred_at` date field type
     let occurred_at = schema_builder.add_date_field("occurred_at", opts);
     let event_type = schema_builder.add_text_field("event", STRING | STORED);

examples/iterating_docs_and_positions.rs

@@ -7,10 +7,11 @@
 // the list of documents containing a term, getting
 // its term frequency, and accessing its positions.
 
+use tantivy::postings::Postings;
 // ---
 // Importing tantivy...
 use tantivy::schema::*;
-use tantivy::{doc, DocSet, Index, IndexWriter, Postings, TERMINATED};
+use tantivy::{doc, DocSet, Index, IndexWriter, TERMINATED};
 
 fn main() -> tantivy::Result<()> {
     // We first create a schema for the sake of the

examples/warmer.rs

@@ -3,10 +3,11 @@ use std::collections::{HashMap, HashSet};
 use std::sync::{Arc, RwLock, Weak};
 
 use tantivy::collector::TopDocs;
+use tantivy::index::SegmentId;
 use tantivy::query::QueryParser;
 use tantivy::schema::{Schema, FAST, TEXT};
 use tantivy::{
-    doc, DocAddress, DocId, Index, IndexWriter, Opstamp, Searcher, SearcherGeneration, SegmentId,
+    doc, DocAddress, DocId, Index, IndexWriter, Opstamp, Searcher, SearcherGeneration,
     SegmentReader, Warmer,
 };