Elasticsearch index management, for stage/promote pattern.

See also:

• elasticsearch-rails-ha

A busy ES installation needs to stay up and serving requests. If you need to build a new index, you can "stage" it alongside the live index, and then "promote" the stage to be live. This allows for zero downtime cutovers of new indices.

require 'elasticsearch'
require 'elasticsearch/index_stager'

client = Elasticsearch::Client.new log: true
stager = Elasticsearch::IndexStager.new(index_name: 'foo', es_client: client)

client.index(index: stager.tmp_index_name, type: 'article', id: 1, body: { title: 'Test' })
stager.alias_stage_to_tmp_index

results = client.search(index: stager.stage_index_name, body: { query: { match: { title: 'test' } } })
stager.promote
results = client.search(index: stager.index_name, body: { query: { match: { title: 'test' } } })

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