Introduce cursor tracking akin to jdbc input (#205) #234
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Provide field value tracking, persisted to disk on each search_after page.
Adds
:last_value
and:present
placeholders, allowing the plugin to inject the cursor value and now-30 seconds, respectively, in the query string.Useful to track new data being written to an index or series of indices.
Works best with nano second precision timestamps added by Elasticsearch's Ingest Pipelines.
backport #205 to 4.x