elasticsearch.rake

# Run with: rake environment elasticsearch:reindex
# Begins by creating the index using tire:import command
# This will create the "official" index name, e.g. "person" each time.
# Then we rename it to, e.g. "person20121001" and alias "person" to it.

namespace :elasticsearch do
  desc "re-index elasticsearch"
  task :reindex => :environment do

    klasses = [Ticket]

    klasses.each do |klass|
      puts "[Import] ::::::: Class: #{klass} :::::::::\n"

      ENV['CLASS'] = klass.name
      ENV['INDEX'] = new_index = klass.tire.index.name << '_' << Time.now.strftime('%Y%m%d%H%M%S')
      
      puts "[Import] New index name #{new_index}"

      Rake::Task["tire:import"].execute("CLASS='#{klass}'")

      puts '[IMPORT] about to swap index'
      if alias = Tire::Alias.find(klass.tire.index.name)
        puts "[IMPORT] aliases found: #{alias.indices.to_ary.join(',')}. deleting..."
        old_indices = alias.indices
        
        old_indices.each do |index|
          alias.indices.delete index
        end    
        
        alias.indices.add new_index
        alias.save
        
        old_indices.each do |index|          
          puts "[IMPORT] deleting index: #{index}"          
          i = Tire::Index.new(index)          
          i.delete if i.exists?
        end
      else
        puts "[IMPORT] no aliases found. deleting index. creating new one and setting up alias."
        klass.tire.index.delete
        alias = Tire::Alias.new
        alias.name(klass.tire.index.name)
        alais.index(new_index)
        alias.save
        puts "Saved alias #{klass.tire.index.name} pointing to #{new_index}"
      end

      puts "[IMPORT] done. Index: '#{new_index}' created."
    end
  end
end