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Are there any that fit the log searching use case, apart from loki which doesn't do full text searching?

Do you mean you want full-text search against logs? In that case they all work, you just have to ingest the logs as documents in each one.

Or try Seq which is a log-focused system: https://datalust.co/seq

I think vector[0] does what you are asking for.

Vector is a log/event forwarding system. It moves data between sources and sinks with optional transforms. It doesn't store or search it.

Thanks, but I'm looking for alternatives to the ElasticSearch in that diagram.

Vector looks like a good choice to fill the index, and should be easy enough to modify to support Meili.