message: Create the StringIndex only once.
diff: @@ -1846,6 +1846,7 @@ TEST(StringIndex_Insensitive_Fuzz)
  ref_type ref = StringColumn::create(Allocator::get_default());
  StringColumn col(Allocator::get_default(), ref);
  + col.create_search_index();
  for (size_t iter = 0; iter < iters; iter++) {
  size_t rows = fastrand(2 * REALM_MAX_BPNODE_SIZE - 1);
  @@ -1862,8 +1863,6 @@ TEST(StringIndex_Insensitive_Fuzz)
  col.add(s);
  }
  - col.create_search_index();
  -
  for (size_t t = 0; t < 1000; t++) {
  std::string s;
  