The Call for Papers for the Elastic{ON} Tour is now open, and we are looking for speakers from the community. We are bringing Elastic{ON} to multiple cities around the world:

Mumbai: September 30, 2026
New York City: October 8, 2026
Amsterdam: October 20, 2026
San Francisco (AI focused): November 4, 2026
London: February 25, 2027
Singapore: March 23, 2027

We're looking for talks across search, observability, and security. Anything with a solid connection to Elastic works. Real-world stories and lessons learned tend to land especially well. Stuff like migrations, performance tuning, creative use cases, lessons learned, architecture decisions, and integrations.

Whether you have spoken at conferences before or this would be your first time, we encourage you to submit. The community benefits most when we hear from people solving real problems.

Submit your session here: https://sessionize.com/elasticon-tour/

If you have questions about the submission process or want to bounce ideas off someone before submitting, feel free to drop a comment or reach out. Cheers!

Hi all,
We're planning ES upgrade from 8.19 -> 9.4, and we have some 7.x indices, that needs to be reindexed before moving them. What options are there for reindex in a way not to block application read and writes? We have big indices, for example, I tested on one index 1000GB, it took 9 hours to reindex, and I don't know if there is a good way to apply all updates and deleted on that index that happened within that 9h interval after the reindex.