• Google search volume and quantity of search result pages (blogs, recipes, etc.)
• Mentions in LinkedIn profiles as a skill
• Number of job post listings as a requisite skill
• Social media mentions
It is a measure of "mindshare" or "share of voice." Not one of market share ($$$) or utilization (TBs under management, etc.).
With that said, in the August 2024 listing:
• Elasticsearch is ranked #8 (of 423 systems tracked), with an index score of 129.83
• OpenSearch is ranked #35, with an index score of 16.47
This would make OpenSearch about an eighth as prevalent.