Search results incomplete during full indexing.

[Travis Tripp]

When a full reindex is being performed, the index is cleared for each document type. There is no way for a client to detect that they have partial results. I believe we need the following:

In /v1/search/plugins

provide a status for each plugin:

  Active, Disabled, Indexing

In the future, we might include things like cache latency if we get really smart.

But in addition, we should respond to search queries with some way to detect cache / indexing state. Either a field injected into response body (easiest to pass through proxy layers like horizon django server) or a header. Or ever an outright http rejection with appropriate status code.

[Travis Tripp (travis-tripp)]

I opened a new blueprint on this that should superced this bug. So closing this one for now: https://blueprints.launchpad.net/searchlight/+spec/zero-downtime-reindexing