Solr 7 Migration

Helpful Links

• https://lucene.apache.org/solr/guide/7_2/major-changes-from-solr-5-to-solr-6.html#major-changes-from-solr-5-to-solr-6
• https://lucene.apache.org/solr/guide/6_6/upgrading-solr.html
• https://lucene.apache.org/solr/guide/7_3/solr-upgrade-notes.html
• https://lucene.apache.org/solr/guide/7_3/major-changes-in-solr-7.html#major-changes-in-solr-7

Solrj API changes

• Creating a collection
  • Was: new CollectionAdminRequest.Create().setCollectionName(collectionName).setNumShards(numShards).setConfigName(solrConfigName)
  • Now: CollectionAdminRequest.create(collectionName, solrConfigName, numShards, numReplicas)
• Creating a collection alias
  • Was: new CollectionAdminRequest.CreateAlias().setAliasName(reindex.getDefaultCollection()).setAliasedCollections(collectionName)
  • Now: CollectionAdminRequest.createAlias(aliasName, collectionName)
• Creating collection reload
  • Was: new CollectionAdminRequest.Reload().setCollectionName(collectionName);
  • Now: CollectionAdminRequest.reloadCollection(collectionName);
• CloudSolrClient#getZkStateReader().getClusterState().getCollections() has been removed
  • Methods available as replacement: ClusterState#hasCollection, ClusterState#getCollectionsMap, ClusterState#getCollectionStates, and ClusterState#getCollectionOrNull
• CloudSolrClient contructors changed
  • Now it takes a CloudSolrClient#Builder object
• GenericSolrRequest api change
  • Was: Set content using GenericSolrRequest#setContentStreams
  • Now: Set content using GenericSolrRequest#setContentWriter

Solr config changes

• All Trie fields now Point fields
  • precisionStep has been removed
• solr.WordDelimiterFilterFactory now solr.WordDelimiterGraphFilterFactory
• solr.SynonymFilterFactory now solr.SynonymGraphFilterFactory
• solr.ManagedSynonymFilterFactory now solr.ManagedSynonymGraphFilterFactory
• All graph filter factories used in indexing must be followed by solr.FlattenGraphFilterFactory in the index analyzer

Migration

• Migrating your Solr server is not required but it is advised since there's no guarantee that all Solrj 7 APIs will communicate correctly with a Solr 5 server
• Recommended that you do a full reindex regardless if you're upgrading your Solr server or not.