Hi Alessio,
this optimization also produce a less RAM requirements on Solr server?
Unfortunately we didn't measure this before/after the change. Since we are removing features (position information), I wouldn't expect the memory requirement to increase, but I'm no expert.
To be honest, I've not been able to measure in any sensible way the memory really required by Solr. The memory directly used by the Solr process is rather limited, but a lot of memory is used for file caches, which also feels (again not an expert) important for good performances.
The attached schema and config file also works with Solr 7.7.0? Since dovecot provide schema and config for 7.7.0 will be useful for many of us a path based on it.
At least the solrconfig.xml shouldn't work with 7.7.0 since I increased the luceneMatchVersion to match 8.6 and imported a few defaults from the default upstream 8.6 configuration. I think these changes could be ignored for 7.7.0.
For schema.xml, I made quite a few changes, but all seem to be backward compatible:
- Remove unused 'boolean' field type
- Remove KeywordMarkerFilterFactory: protwords are usually empty anyway
- User a simper 'text_basic' field type (no StopFilterFactory, SynonymGraphFilterFactory or PorterStemFilterFactory) for processing non-human fields (all but body and subject)
- Remplace autoGeneratePhraseQueries & positionIncrementGap by omitTermFreqAndPositions="true" & omitPositions="true" on TextField fieldtypes (as discussed in this thread)
- Minor modifications on WordDelimiterGraphFilterFactory when used in search to have better match (things like 'covid19' are indexed as ['covid', '19', 'covid19'] but only searched as 'covid19')
From taking a quick look at the documentation, I _think_ most of them are compatible with 7.7.0, but without testing, I can't guarantee it.
Cheers, Vincent