It's not reliable: https://www.quora.com/Why-shouldnt-I-use-ElasticSearch-as-my-primary-datastore/answer/Mani-Gandham https://www.quora.com/Why-shouldnt-I-use-E

It's not reliable: https://www.quora.com/Why-shouldnt-I-use-ElasticSearch-as-my-primary-datastore/answer/Mani-Gandham https://www.quora.com/Why-shouldnt-I-use-ElasticSearch-as-my... The v7 upgrade to a new cluster protocol (zen2) has improved things but overall the system has a long history of losing or destroying data. It's better to have a primary OLTP system that's ACID and reliable while using ES as the secondary search source. You can also remove the _source field if you just need matches without the original content. It's common to see pattern used with a relational database since, as you can see, Mongo doesn't buy you much else as another document-store.