Shows 'indexing' window in the top right every time I type a letter

[faraazahmad]

I'm using Rust and in insert mode, every time I type a letter, I see this window in the top right. naturally, this is the most annoying thing ever.

Steps to reproduce:

1. Use the official Rust plugin
2. Open a rust file and start typing
3. A small window with "Indexing" and a progress bar should appear in the top right

You should see this

Neovim version:

NVIM v0.4.3                                                                                                                                                                                     
Build type: Release                                                                                                                                                                             
LuaJIT 2.1.0-beta3                                                                                                                                                                              
Compilation: /usr/bin/cc -g -O2 -fdebug-prefix-map=/build/neovim-gOb7vg/neovim-0.4.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=1 -DDISABLE_LOG -
Wdate-time -D_FORTIFY_SOURCE=1 -O2 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit
-fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/build/neovim-gOb7v
g/neovim-0.4.3/build/config -I/build/neovim-gOb7vg/neovim-0.4.3/src -I/usr/include -I/usr/include/lua5.1 -I/build/neovim-gOb7vg/neovim-0.4.3/build/src/nvim/auto -I/build/neovim-gOb7vg/neovim-0
.4.3/build/include                                                                                                                                                                              
Compiled by team+vim@tracker.debian.org

Syntastic Info:

Syntastic version: 3.10.0-21 (Vim 800, Neovim, Linux)                                                                                                                                           
Info for filetype: vim                                                                                                                                                                          
Global mode: passive                                                                                                                                                                            
Filetype vim is passive                                                                                                                                                                         
The current file will not be checked automatically                                                                                                                                              
Available checkers: -                                                                                                                                                                           
Currently enabled checkers: -                                                                                                                                                                   
syntastic: 1037.869453: &shell = '/bin/bash', &shellcmdflag = '-c', &shellpipe = '2>&1| tee', &shellquote = '', &shellredir = '>%s 2>&1', &shelltemp = 1, &shellxquote = '', &autochdir = 0, &sh
ellxescape = ''

[lcd047]

Syntastic itself doesn't support Rust, a Rust checker for syntastic is added by rust.vim. Personally I'm pretty sure your problem has nothing to do with syntastic, but if you have reasons to suspect otherwise please post a bug report to rust.vim.