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Faking Index per User with Aliases
editFaking Index per User with Aliases
editTo keep our design simple and clean, we would like our application to believe that
we have a dedicated index per user—or per forum in our example—even if
the reality is that we are using one big shared index. To do
that, we need some way to hide the routing
value and the filter on
forum_id
.
Index aliases allow us to do just that. When you associate an alias with an index, you can also specify a filter and routing values:
PUT /forums/_alias/baking { "routing": "baking", "filter": { "term": { "forum_id": "baking" } } }
Now, we can treat the baking
alias as if it were its own index. Documents
indexed into the baking
alias automatically get the custom routing value
applied:
We still need the |
Queries run against the baking
alias are run just on the shard associated
with the custom routing value, and the results are automatically filtered by
the filter we specified:
GET /baking/post/_search { "query": { "match": { "title": "ginger nuts" } } }
Multiple aliases can be specified when searching across multiple forums: