https://solr.apache.org/docs/7_4_0/solr-core/org/apache/solr/update/UpdateLog.html
UpdateLog (Solr 7.4.0 API)
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https://solr.apache.org/docs/4_6_1/solr-core/org/apache/solr/update/UpdateLog.RecoveryInfo.html
UpdateLog.RecoveryInfo (Solr 4.6.1 API)
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