Derived from https://github.com/samvera/active_fedora/blob/10.2-stable/lib/active_fedora/indexing.rb#L86-L123

safer_reindex_everything.rb

require 'active-fedora'
require 'json'

def descendant_uris(uri)
  begin
    resource = Ldp::Resource::RdfSource.new(ActiveFedora.fedora.connection, uri)
  rescue
    STDERR.puts "Failed to create resource for uri #{uri}"
    return []
  end


  begin
    return [] unless resource.head.rdf_source?
  rescue => e
    STDERR.puts "Error trying to call resource.head.rdf_source? on #{uri}"
    return []
  end

  begin
    duris = resource.graph.query(predicate: ::RDF::Vocab::LDP.contains)
  rescue
    STDERR.puts "Couldn't get resource.graph.query for #{uri}"
    return []
  end

  duris = duris.map do |descendant|
    begin
      descendant.object.to_s
    rescue
      STDERR.puts "Can't call .object.to_s on #{descendant}"
    end
  end

  duris.inject([uri]) {|acc, d| acc.concat(descendant_uris(d))}
end


def reindex_uris(uris)
  uris.each do |uri|
    begin
      ActiveFedora::Base.find(ActiveFedora::Base.uri_to_id(uri)).update_index
    rescue => e
      STDERR.puts "Trouble reindexing #{uri}: #{e}"
    end
  end
end


duris = descendant_uris(ActiveFedora::Base.id_to_uri(''))

File.open('decendant_urls.json', 'w:utf-8') do |f|
  f.puts duris.to_json
end

duris.shift # take out root

reindex_uris(duris)