当我运行时：
$ heroku run bundle exec rake environment elasticsearch:import:model CLASS='Artist' FORCE=true
终端的响应是：
Running bundle exec rake environment elasticsearch:import:model CLASS=Artist FORCE=true on doremi... up, run.3015
Starting up a new ElasticSearch client with https://hexcode.bonsai.io
rake aborted!
NameError: uninitialized constant Elasticsearch
/app/vendor/bundle/ruby/2.0.0/gems/bonsai-elasticsearch-rails-0.0.4/lib/bonsai/elasticsearch/rails.rb:4:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:85:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:85:in `rescue in block in require'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:68:in `block in require'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require'
/app/config/application.rb:16:in `<top (required)>'
/app/Rakefile:4:in `require'
/app/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)
该错误似乎源于此 require 语句lib/tasks/elasticsearch.rake
require 'elasticsearch/rails/tasks/import'
我检查过我所有的elastic-*gem 都是最新版本：elasticsearch-rails 和 elasticsearch-model 为 0.1.7，bonsai-elasticsearch-rails 为 0.0.4，但我确实注意到这里https://rubygems.org/ gems/bonsai-elasticsearch-rails bonsai-elastic-search rails 依赖于 bundler 1.5 而 Heroku 使用的是 1.9.7，据我所知，这是不可能改变的。这会是问题的症结所在吗？
当我尝试部署时，我的日志中也有类似的错误
Oct 09 17:04:27 doremi app/worker.1: NameError: uninitialized constant Elasticsearch
Oct 09 17:04:27 doremi app/worker.1: rake aborted!
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bonsai-elasticsearch-rails-0.0.4/lib/bonsai/elasticsearch/rails.rb:4:in `<top (required)>'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:85:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:85:in `rescue in block in require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:68:in `block in require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/config/application.rb:16:in `<top (required)>'
Oct 09 17:04:27 doremi app/worker.1: /app/Rakefile:4:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/Rakefile:4:in `<top (required)>'
Oct 09 17:04:27 doremi app/worker.1: LoadError: cannot load such file -- bonsai-elasticsearch-rails
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `each'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:72:in `block in require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `each'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler/runtime.rb:61:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/vendor/bundle/ruby/2.2.0/gems/bundler-1.9.7/lib/bundler.rb:134:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/config/application.rb:16:in `<top (required)>'
Oct 09 17:04:27 doremi app/worker.1: /app/Rakefile:4:in `require'
Oct 09 17:04:27 doremi app/worker.1: /app/Rakefile:4:in `<top (required)>'