Solr 8.7 Roadmap

Item	Description	Contributors	Theme	Jira
SIP-9	Advanced Query parser and supporting lucene filters	Mike Nibeck (LOC contributor), Gus Heck	Feature	SOLR-14597
Multi-threaded search (SOLR-13350)	Multi threaded search across multiple segments at once, using CollectorManagers	Ishan Chattopadhyaya, Atri Sharma	Optimization	SOLR-13350
CPU Utilisation Based Circuit Breakers		Atri Sharma	Feature	SOLR-14615
New Cluster API	Standard set of APIs which consists of only interfaces. We should ensure that They are used wherever possible in server/client code. We should expose these interfaces to our plugins. They should be well -documented and we must always strive to maintain backward compatibility on these interfaces between versions	Noble Paul	Clean-API	SOLR-14680
New Remote Call API	Remote Calls should have simple constructs and they must be public interfaces. This should be used in all inter-node/client-server communications	Noble Paul	Clean-API	SOLR-14712
Alternate SolrJ APIs without using NamedList/SimpleOrderedMap/Map	Get rid of concrete classes such as NamedList,SimpleOrderedMap, Map, etc and build our public APIs with interfaces	Noble Paul	Clean-API	SOLR-14730

Solr 9.0 Roadmap

Item	Description	Contributors	Theme
First party packages & Slim Solr distribution	Solr should have first party packages, and a slim Solr tarball that doesn't have the first party packages	Ishan, Noble, Jan, et. al.	Lean Solr Core
V2 API to be the default	Ref guide docs should use V2, where necessary we build V2 APIs, switch SolrJ to use V2 APIs, etc.		Usability
Autoscaling / Replica assignment V2	A new pluggable framework replaces current autoscaling	Andrzej, Ilan, Noble	Lean Solr Core
HDFS moved away from Solr-Core	Build a first party package out of HDFS support	Istvan Farkas, Gezapeti	Lean Solr Core
Remove Ant support	This is partly done
Index Lifecycle Management	Automatically move indices between hot, warm and cold phases	Atri Sharma	Feature
POJOs instead of loosely typed objects	Start using POJOs/interfaces wherever possible in public APIs where ever possible	Noble Paul