Under the traditional search, is the elasticsearch search result safe?

Recently, our company tried to use ES to improve the previous business experience. The result is awesome. However my boss ask me how safe is elasticsearch, and I said I need to ask a professional. While i am in a finance company, our bosses , sure and i , concern about that , is the result safe, you know , is there any possible that elastic search loss some message while this message matches the query condition? if this happened , that's a horrible event for financial business.
and forgive me English is not good.

We put all our known resiliency issues here - https://www.elastic.co/guide/en/elasticsearch/resiliency/current/index.html

appreciated for your help , that helps me a lot

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