Disclaimer

This is a Pre-ASF release and did not undergo a formal review by the PMC.

What's Changed

Change HttpProtocol to defer to configured values for retryOnConnectionFailure and followRedirects by @ndtreviv in #1056
Cache redirected robots.txt for target host only if path is /robots.txt and query is empty by @sebastian-nagel in #1057
Issue #1043: Fixing problems after restart of Frontier service by @michaeldinzinger in #1054
#1049 Replace "Collapse and Expand Results" Solr query with "Result Grouping" query. by @syefimov in #1053
OpenSearch 2.7.0 + renamed OpenSearchConnection by @jnioche in #1064
BasicURLNormalizer .unmangleQueryString() returns invalid results if "&" symbol in a parents path #1059 by @syefimov in #1062
Dependency upgrades. fixes #1066 by @jnioche in #1067
Automatic creation of index definitions should use the bolt type by @jnioche in #1069
mechanism to retrieve more generic value of configuration by @jnioche in #1071
Create DeletionBolt.java for Solr. #1050 by @syefimov in #1073
Increase the number of redirects to 5 for Robots.txt fetching by @michaeldinzinger in #1074
Issue #1042: Adapt parsing of robots.txt files by @michaeldinzinger in #1055
Test URL Filtering from the command line by @jnioche in #1081

Full Changelog: 2.8...2.9