Index: clang-tools-extra/clangd/index/dex/Iterator.h
===================================================================
--- clang-tools-extra/clangd/index/dex/Iterator.h
+++ clang-tools-extra/clangd/index/dex/Iterator.h
@@ -93,9 +93,8 @@
   ///
   /// Where Type is the iterator type representation: "&" for And, "|" for Or,
   /// ChildN is N-th iterator child. Raw iterators over PostingList are
-  /// represented as "[ID1, ID2, ..., {IDN}, ... END]" where IDN is N-th
-  /// PostingList entry and the element which is pointed to by the PostingList
-  /// iterator is enclosed in {} braces.
+  /// represented as "[... ID ...]" where ID is the element under iterator
+  /// cursor.
   friend llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
                                        const Iterator &Iterator) {
     return Iterator.dump(OS);
Index: clang-tools-extra/clangd/index/dex/PostingList.cpp
===================================================================
--- clang-tools-extra/clangd/index/dex/PostingList.cpp
+++ clang-tools-extra/clangd/index/dex/PostingList.cpp
@@ -61,10 +61,14 @@
 private:
   llvm::raw_ostream &dump(llvm::raw_ostream &OS) const override {
     OS << '[';
+    if (Index != std::begin(Documents))
+      OS << "... ";
     if (Index != std::end(Documents))
       OS << *Index;
     else
       OS << "END";
+    if (Index != std::end(Documents) && Index != std::end(Documents) - 1)
+      OS << " ...";
     OS << ']';
     return OS;
   }
Index: clang-tools-extra/unittests/clangd/DexTests.cpp
===================================================================
--- clang-tools-extra/unittests/clangd/DexTests.cpp
+++ clang-tools-extra/unittests/clangd/DexTests.cpp
@@ -262,13 +262,15 @@
   const PostingList L4({0, 1, 5});
   const PostingList L5({});
 
-  EXPECT_EQ(llvm::to_string(*(L0.iterator())), "[4]");
+  EXPECT_EQ(llvm::to_string(*(L0.iterator())), "[4 ...]");
 
   auto Nested =
       createAnd(createAnd(L1.iterator(), L2.iterator()),
                 createOr(L3.iterator(), L4.iterator(), L5.iterator()));
 
-  EXPECT_EQ(llvm::to_string(*Nested), "(& (| [5] [1] [END]) (& [1] [1]))");
+  EXPECT_EQ(
+      llvm::to_string(*Nested),
+      "(& (| [... 5] [... 1 ...] [END]) (& [1 ...] [1 ...]))");
 }
 
 TEST(DexIterators, Limit) {