This change adds a `index.look_back_time` index setting that sets the `index.time_series.start_time` setting for the first backing index when a data stream is created.
This allows accepting data that is older for initial indexing without changing the `index.look_ahead_time` setting. This setting also controls the `index.time_series.end_time` setting and would affect rollovers as well.
The default for the `index.look_back_time` is `2h`, which means documents with `@timestamp` up to 2 hours after creation of the data stream are allowed to be indexed. This is the same as is without this change, because `index.look_ahead_time` is used to set `index.time_series.start_time` of the first backing index.
Closes#98463
Here we enable aggregations previously not allowed on fields of type counter.
The decision of enabling such aggregations even if the result is "meaningless"
for counters has been taken to favour TSDB adoption.
Aggregations now allowed, other than the existing ones, include:
* avg
* box plot
* cardinality
* extended stats
* median absolute deviation
* percentile ranks
* percentiles
* stats
* sum
* value count
I included tests for the weighted average and matrix stats aggregations too.
Resolves#97882
* [DOCS] Update manual downsampling documentation to use TSDS
* Swap manual and ILM downsampling examples in nav
* Typo
* Update prerequisites based on review feedback
* Warn against deleting the old backing index.
* Clarify counter/gauge results
* Mention that the downsampled type is 'aggregate_metric_double'
Update tsdb docs to include a warning that the format of the `_tsid` field shouldn't be relied upon and added additional limitations about dimension fields.
It seems that for now we don't have a good use for the histogram and summary metric types.
They had been left as place holders for a while, but at this point there is no concrete plan forward for them.
This PR removes the histogram and summary metric types. We may add them back in the future.
Also, this PR completely removes the time_series_metric mapping parameter from the histogram field type and only allows the gauge metric type for aggregate_metric_double fields.
Added a requirement that index.look_ahead_time index setting
can't be lower than time_series.poll_interval setting.
Additional changes:
* Fixed a mistake in the docs that referenced indices.lifecycle.poll_interval
instead of time_series.poll_interval.
* Moved index.look_ahead_time setting to data stream module.
* Revert "Revert "[DOCS] Add TSDS docs (#86905)" (#87702)"
This reverts commit 0c86d7b9b2.
* First fix to tests
* Add data_stream object to index template
* small rewording
* Add enable data stream object in gradle example setup
* Add bullet about data stream must be enabled in template
* [DOCS] Add TSDB docs
* Update docs/build.gradle
Co-authored-by: Adam Locke <adam.locke@elastic.co>
* Address Nik's comments, part 1
* Address Nik's comments, part deux
* Reword write index
* Add feature flags
* Wrap one more section in feature flag
* Small fixes
* set index.routing_path to optional
* Update storage reduction value
* Update create index template code example
Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
Co-authored-by: Adam Locke <adam.locke@elastic.co>
