Edit and restructure time series docs

manage-data/data-store/data-streams/advanced-topics-tsds.md

@@ -0,0 +1,16 @@
+---
+navigation_title: "Advanced topics"
+applies_to:
+  stack: ga
+  serverless: ga
+products:
+  - id: elasticsearch
+---
+
+# Advanced topics for working with time series data streams
+
+This section contains information about advanced concepts and operations for [time series data streams](/manage-data/data-store/data-streams/time-series-data-stream-tsds.md):
+
+- [](/manage-data/data-store/data-streams/time-bound-tsds.md)
+- [](/manage-data/data-store/data-streams/reindex-tsds.md)
+- [](/manage-data/data-store/data-streams/tsds-ingest-otlp.md)

manage-data/data-store/data-streams/downsampling-time-series-data-stream.md

@@ -8,7 +8,6 @@ applies_to:
 products:
   - id: elasticsearch
 ---
-% TODO flesh out after the rest of the section has been restructured
 
 # Downsampling a time series data stream [downsampling]
 

manage-data/data-store/data-streams/query-downsampled-data.md

@@ -2,7 +2,7 @@
 applies_to:
   stack: ga
   serverless: ga
-navigation_title: "Query downsampled data"
+navigation_title: "Querying"
 products:
   - id: elasticsearch
 ---
@@ -25,4 +25,12 @@
 
 When offsetting is applied, responses include the field `downsampled_results_offset: true`.
 
-For more details, refer to [Date histogram aggregation: Time zone](elasticsearch://reference/aggregations/search-aggregations-bucket-datehistogram-aggregation.md#datehistogram-aggregation-time-zone).
+For more details, refer to [Date histogram aggregation: Time zone](elasticsearch://reference/aggregations/search-aggregations-bucket-datehistogram-aggregation.md#datehistogram-aggregation-time-zone).
+
+## {{esql}} `TS` command
+```{applies_to}
+stack: planned
+serverless: preview
+```
+
+You can use the {{esql}} [`TS` command](elasticsearch://reference/query-languages/esql/commands/ts.md) to query time series data streams. The `TS` command is optimized for time series data. It also enables the use of aggregation functions that efficiently process metrics per time series, before aggregating results.

manage-data/data-store/data-streams/quickstart-tsds.md

@@ -200,7 +200,7 @@ The response shows five sample weather data documents.
 :::
 
 :::{tip}
-If you get an error about timestamp values, check the error response for the valid timestamp range. For more details, refer to [](/manage-data/data-store/data-streams/time-series-data-stream-tsds.md#tsds-accepted-time-range).
+If you get an error about timestamp values, check the error response for the valid timestamp range. For more details, refer to [Accepted time range for adding data](/manage-data/data-store/data-streams/time-bound-tsds.md#tsds-accepted-time-range).
 
 :::
 
@@ -316,8 +316,12 @@ This quickstart introduced the basics of time series data streams. To learn more
 * [](/manage-data/data-store/data-streams/time-series-data-stream-tsds.md)
 * [](/manage-data/data-store/data-streams/set-up-tsds.md)
 
+If you're working with OpenTelemetry (OTLP) data, refer to the OTLP documentation:
+* [](/manage-data/data-store/data-streams/tsds-ingest-otlp.md)
+* [](/solutions/observability/get-started/opentelemetry/quickstart/index.md)
+
 For more information about the APIs used in this quickstart, review the {{es}} API reference documentation:
 
 * [Bulk API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-bulk)
 * [Index template API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-put-index-template)
-* [Search API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-search)
+* [Search API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-search)