Error with "resty.rediscluster" while installing this plugin

[anup-krai]

Summary

I am trying out this plugin in Kong pongo but getting below error -

Error: /usr/local/share/lua/5.1/kong/cmd/start.lua:64: nginx: [error] init_by_lua error: /usr/local/share/lua/5.1/kong/tools/utils.lua:710: error loading module 'kong.plugins.scalable-rate-limiter.handler':
...ng/plugins/scalable-rate-limiter/policies/connection.lua:2: module 'resty.rediscluster' not found:No LuaRocks module found for resty.rediscluster
    no field package.preload['resty.rediscluster']
    no file './resty/rediscluster.lua'
    no file './resty/rediscluster/init.lua'
    no file '/usr/local/openresty/site/lualib/resty/rediscluster.ljbc'
    no file '/usr/local/openresty/site/lualib/resty/rediscluster/init.ljbc'
    no file '/usr/local/openresty/lualib/resty/rediscluster.ljbc'
    no file '/usr/local/openresty/lualib/resty/rediscluster/init.ljbc'
    no file '/usr/local/openresty/site/lualib/resty/rediscluster.lua'
    no file '/usr/local/openresty/site/lualib/resty/rediscluster/init.lua'
    no file '/usr/local/openresty/lualib/resty/rediscluster.lua'
    no file '/usr/local/openresty/lualib/resty/rediscluster/init.lua'
    no file '/kong-plugin/resty/rediscluster.lua'
    no file '/kong-plugin/resty/rediscluster/init.lua'
    no file '/usr/local/openresty/luajit/share/luajit-2.1.0-beta3/resty/rediscluster.lua'
    no file '/usr/local/share/lua/5.1/resty/rediscluster.lua'
    no file '/usr/local/share/lua/5.1/resty/rediscluster/init.lua'
    no file '/usr/local/openresty/luajit/share/lua/5.1/resty/rediscluster.lua'
    no file '/usr/local/openresty/luajit/share/lua/5.1/resty/rediscluster/init.lua'
    no file '/root/.luarocks/share/lua/5.1/resty/rediscluster.lua'
    no file '/root/.luarocks/share/lua/5.1/resty/rediscluster/init.lua'
    no file '/usr/local/openresty/site/lualib/resty/rediscluster.so'
    no file '/usr/local/openresty/lualib/resty/rediscluster.so'
    no file './resty/rediscluster.so'
    no file '/usr/local/lib/lua/5.1/resty/rediscluster.so'
    no file '/usr/local/openresty/luajit/lib/lua/5.1/resty/rediscluster.so'
    no file '/usr/local/lib/lua/5.1/loadall.so'
    no file '/root/.luarocks/lib/lua/5.1/resty/rediscluster.so'
    no file '/usr/local/openresty/site/lualib/resty.so'
    no file '/usr/local/openresty/lualib/resty.so'
    no file './resty.so'
    no file '/usr/local/lib/lua/5.1/resty.so'
    no file '/usr/local/openresty/luajit/lib/lua/5.1/resty.so'
    no file '/usr/local/lib/lua/5.1/loadall.so'
    no file '/root/.luarocks/lib/lua/5.1/resty.so'
stack traceback:
    [C]: in function 'require'
    ...ng/plugins/scalable-rate-limiter/policies/connection.lua:2: in main chunk
    [C]: in function 'require'
    ...gin/kong/plugins/scalable-rate-limiter/policies/init.lua:2: in main chunk
    [C]: in function 'require'
    /kong-plugin/kong/plugins/scalable-rate-limiter/handler.lua:1: in main chunk
    [C]: at 0x7f8bda842660
    [C]: in function 'xpcall'
    /usr/local/share/lua/5.1/kong/tools/utils.lua:701: in function 'load_module_if_exists'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:134: in function 'load_plugin_handler'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:221: in function 'load_plugin'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:273: in function 'load_plugin_schemas'
    /usr/local/share/lua/5.1/kong/init.lua:543: in function 'init'
    init_by_lua:3: in main chunk
stack traceback:
    [C]: in function 'error'
    /usr/local/share/lua/5.1/kong/tools/utils.lua:710: in function 'load_module_if_exists'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:134: in function 'load_plugin_handler'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:221: in function 'load_plugin'
    /usr/local/share/lua/5.1/kong/db/dao/plugins.lua:273: in function 'load_plugin_schemas'
    /usr/local/share/lua/5.1/kong/init.lua:543: in function 'init'
    init_by_lua:3: in main chunk

  Run with --v (verbose) or --vv (debug) for more details

How can we fix this error?

Steps To Reproduce

1. Place this plugin code in pongo.
2. Start Pongo and run "kong start".
3. Kong does not start and throws this error.

Additional Details & Logs

• Kong version 2.8