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Based on the experience of an ElasticSearch implementation at bol.com, we'll discuss the consequences of different modes of operation of ElasticSearch in an environment of existing SQL databases. How can you connect ElasticSearch to change queues of other databases, how can the versioning mechanism be used to implement optimistic locking, and what are the consistency consequences of using ElasticSearch as either a free text index on external data, a data cache or as the single source-of-truth system?
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