Hello, im trying to create ElasticSearch mapping in Symfony 2 with help of FOSElasticaBundle. Well it probably is not relevant that I use Symfony 2, but relevant is the fact that Im trying to create mapping as similar to MySQL schema as I can. I stumbled upon situation, where I have foreign key, which can be null. As far as I know there are multiple ways to implement foreign key in ElasticSearch, I chose child/parent approach. Can I implement in this approach the null foreign key which would mean that type would have defined parent, but in some cases parent wouldnt exist?
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