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Routine Discovery Solr Index Maintenance

It is strongly recommended to run maintenance on the Discovery Solr index daily occasionally (from crontab or your system's scheduler), to prevent your servlet container from running out of memory:

[dspace]/bin/dspace index-discovery -o

(Since Solr 4, the underlying optimize operation has been discouraged as mostly unnecessary and renamed. See https://issues.apache.org/jira/browse/SOLR-3141).

Advanced Solr Configuration

Discovery is built as an application layer on top of the Solr open source enterprise search server. Therefore, Solr configuration can be applied to the Solr cores that are shipped with DSpace.
The DSpace Solr instance itself now currently runs two cores. One for collection DSpace Solr based "statistics", the other for Discovery Solr based "search".several cores (which means indexes in Sole parlance). The "statistics" core is for collection of DSpace usage events for statistical purposes (if you have been collecting statistics for multiple years, you may have chosen to use sharding and you will see one core per each year collected). The "search" core is used by Discovery for for search and  faceting, for displaying the collection/community hierarchy and item counts. The "authority" core is used by SolrAuthority to store information about authors, including their data imported from the ORCID registry.

solr
├── solr.xml

solr
├── search
│   ├──└── conf
│   │    ├── admin-extra.html
│    │   ├── elevate.xml
│    │   ├── protwords.txt
│   │    ├── schema.xml
│   │    ├── scripts.conf
│    │   ├── solrconfig.xml
│   │    ├── spellings.txt
│   │    ├── stopwords.txt
│   │    ├── synonyms.txt
│    │   └── xslt
│   │        ├── DRI.xsl
│    │       ├── example.xsl
│    │       ├── example_atom.xsl
│   │        ├── example_rss.xsl
│    │       └── luke.xsl
│   └── conf2
├── solr...xml
└── statistics
    └── conf
        ├── admin-extra.html
        ├── elevate.xml
        ├── protwords.txt
        ├── schema.xml
        ├── scripts.conf
        ├── solrconfig.xml
        ├── spellings.txt
        ├── stopwords.txt
        ├── synonyms.txt
        └── xslt
            ├── example.xsl
            ├── example_atom.xsl
            ├── example_rss.xsl
            └── luke.xsl

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Discovery currently has its own messages.xml file, located at dspace/modules/xmlui/src/main/resources/aspects/Discovery/i18n/messages.xml. You will need to use this file Should you want to add your own labels for new fields and facets you might add, you may add them either to this file or to the main messages.xml file. Same goes for translations - it's encouraged to submit a single messages_XX.xml file including messages from all the separate messages.xml files in DSpace.