Projects should be indexed into solr. They are not artifacts, but they should gain methods like
index_id that are used on artifacts, so a similar pattern is used. Put in a reasonable set of fields of top-level project data that would be useful in searches (name, neighborhood, descr, labels, categories, reg date, etc). (Use-cases for this later will be an admin search page for projects, and also a public project directory)
Also add a method to ProjectRegistrationProvider so that those extensions can add more fields to what gets indexed. Provide a default empty method so that existing providers don't have to be changed. Include good docstrings for Project.index and the ProjectRegistrationProvider method.
After project changes occur that would affect the indexed fields, fire off a background task to update the index for the project. (Somewhat similar to the
add_artifacts task but much much simpler since artifact references aren't applicable here.)
Create a ScriptTask to index all the projects. Use
utils.chunked_find for the loop. Batch up the solr calls in convenient chunks too, so many documents get sent to solr at once.
We will do this later for Users, too, following a very similar pattern, so make new logic a little bit generic so it can be re-used then. Example: background task to add to solr could work for any non-artifact object that has an