The best alternatives to ELKman are reactivesearch.io, Searchkit, and Dejavu V3. If these 3 options don't work for you, we've listed a few more alternatives below.
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Dejavu is a Web UI for Elasticsearch that allows easy data importing (GUI for JSON / CSV import), adding custom mappings for fields, as well as add / edit / filter data visually or via Elasticsearch queries. It solves the PITA that is indexing / re-indexing / creating mappings while working with Elasticsearch.
Autorest.io is a no-code Rest API creation tool. In under 30 seconds, create an API by connecting a database & saving your query. By removing the need for a developer team, you can save time, resources, and overhead expenses. Serverless, scalable, & secure.