create index if it doesn’t exist.
create index if it doesn’t exist.

OpenGazettes/aleph,alephdata/aleph,OpenGazettes/aleph,pudo/aleph,gazeti/aleph,OpenGazettes/aleph,alephdata/aleph,gazeti/aleph,pudo/aleph,OpenGazettes/aleph,gazeti/aleph,pudo/aleph,alephdata/aleph,alephdata/aleph,alephdata/aleph,gazeti/aleph