Is there a size limit for the default summary index?

[Halki]

Is there a size limitation beyond the underlying filesystem for the default summary index? If so, how big can it grow?

[gkanapathy]

The shipped maximum is 500,000 MB (about 500 GB), subject to lower limits imposed by the size of the file system that hot/warm and cold paths are on. You can raise these, as well as restrict how much is written to the hot/warm or cold filesystem by configurations in indexes.conf.

[gkanapathy]

And note that in general you may want to create new indexes for summaries. There is nothing fundamentally different about a summary index vs a regular index.