There are some bugs on solr search for tags:

• Create a tag X on site A
  • Create some contents with this tag
  • Solr search tool
    • Displays the name of the tag, not its label (KO)
  • Search service
    • Parameters: Results > Facets > Tags
      • There is only the result count, not the label nor the name of the tag (KO)
• Delete the tag X on site A
  • Solr search tool
    • The deleted tag appears, with its name, considering the tag still exists (KO)
  • Search service
    • Results: Facets > Tags
      • The tag still appears (its check box at least) (KO)
• Create a tag X on site A and a tag Y on site B
  • Create some contents with those tags on respective sites
  • Solr search tool
    • Displays the tags of all sites (OK)
  • Search service
    • Contexts: select current site, site B or all sites
      • the tag parameter depend on the selected site (OK)
    • Context; site B. Criteria: Tags > contains > the exact value
      • tag selector shows the tag of the current site, not the tags of the site B, it should depend on the context (KO)
    • Context: site B. Criteria: Tags > contains > user value
      • the tags in the select box are the tags of the current site, not the tags of the site B, it should depend on the context (KO)
    • Results: Facets > Tags
      • Tags of both sites appears (OK)
• Create a tag X on site A and a tag X on site B
  • Create some contents with those tags on respective sites
  • Solr search tool
    • Merges the two tags in one, and cumulate the result count (KO)
  • Search service
    • Does not work at all, there is an exception in SaxEnumeratedCriteriaComponent, even if there is no criteria on tags (KO)