Enable Lila search

• Install elasticsearch 7.x.x

  no special config necessary, we'll use the default port 9200

• Setup lila-gif (for game result thumbnails):

  git clone https://github.com/lichess-org/lila-gif
  cd lila-gif
  cargo run
  

  ./target/debug/lila-gif is the binary that cargo builds & runs

• Setup lila-search:

  git clone https://github.com/lichess-org/lila-search
  cd lila-search
  sbt stage
  ./target/universal/stage/bin/lila-search
  

  sbt run doesn't currently work for lila-search which is why we use stage build. probably fixed by the time you read this.

• Add the following line to lila/conf/application.conf:

  search.enabled = true
  

• IMPORTANT! Once lila-search and elasticsearch are running but before playing / analyzing any games on lila, you must do this:

  curl -XPOST http://localhost:9673/mapping/game
  

• Now you can startup lila, login as the lichess user, go to /dev/cli, and run these commands:

  forum search reset
  team search reset
  study search reset
  

You should now be able to search. Games are added to the index only when they are completed or analyzed (by computer), so it may take you awhile to build up a decent sized index for them.