Michael Gibney

SOLR-15045: Execute local leader commit in parallel with distributed commits in DistributedZkUpdateProcessor

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See also: [SOLR-15045](https://issues.apache.org/jira/browse/SOLR-15045)

See issue [SOLR-13807](https://issues.apache.org/jira/browse/SOLR-13807). The latter of the two commits pushed here is the one associated with this PR/issue; the former commit is a "shim" introducing changes from upstream dependency [SOLR-13132](https://issues.apache.org/jira/browse/SOLR-13132)...

Document breaking change regarding use of `solr_local_params` as of Solr 7.2

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For users interested in upgrading Solr backend, Solr 7.2+ introduces a change in handling of local parameters (`solr_local_parameters`) that is likely to break many existing BL configurations.The upstream change [SOLR-11501](https://issues.apache.org/jira/browse/SOLR-11501)...

SOLR-12457: improve compatibility/support for sort by field-function

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See: [SOLR-12457](https://issues.apache.org/jira/browse/SOLR-12457) Continuation of: https://github.com/apache/lucene-solr/pull/989 Affects marshal/unmarshal of sort values for field-function sorts, native numeric wrapper for multivalued Trie field docValues, and missingValue (sortMissingFirst/sortMissingLast) wrt field-function sort.

SOLR-16162: FilterQuery should implement DocSetProducer

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See: [SOLR-16162](https://issues.apache.org/jira/browse/SOLR-16162) "producing a DocSet" is what FilterQuery is actually doing anyway; but more important practically: this avoids the cloning of the backing query's DocSet (and the creation of superfluous...

SOLR-16046: fix thread leaks from non-blocking ZooKeeper.close()

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See: [SOLR-16046](https://issues.apache.org/jira/browse/SOLR-16046)

SOLR-16163: Review unintended try-with-resources closing-order modifications

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See: [SOLR-16163](https://issues.apache.org/jira/browse/SOLR-16163)

See: [SOLR-16017](https://issues.apache.org/jira/browse/SOLR-16017) add a hook for initializing caches by passing a reference to the first registered searcher This complements (and is analogous to) `SolrCache.warm(...)`; together, the new `bootstrap(...)` method and...