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I am not sure every comment critical of elastic's move has been down voted consistently to grey them out.

This has happened with my comments on other posts, it's content is that instead of using license encumbered ELK product people can use SOLR, Vespa or Lucene which are truly open source. It was down voted enough to move it to last or grey it out to make it difficult to read.

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solr, vespa, and lucene only replace the elasticsearch part of ELk. Fluentd is an obvious replacment for Logstash, but I'm not sure what a good open source alternative to Kibana is that is compatible with solr, vespa, or lucene.

Lucene is a low level library which is internally used by ElasticSearch and Solr. Vespa is built from the ground up - it does not use Lucene.

Grafana comes to mind as kibana replacement.

My understanding is that grafana is good at visualization, not searching for specific events.

this is changing as grafana evolves to move into logs in addition to metrics

Interesting, however it doesn't seem like it is a full replacement, since it doesn't do full text indexing:

> Loki is meant to be complementary to existing solutions like Elasticsearch and Splunk that do full text indexing.

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