Merge branch 'elastic:main' into bugfix/highlighting-for-constant_keyword-field-type

Author: piergm

docs/changelog/94954.yaml

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+pr: 94954
+summary: Asset tracking - geo_line for TSDB
+area: Geo
+type: enhancement
+issues: []

docs/changelog/96224.yaml

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+pr: 96224
+summary: Add multiple queries for ranking to the search endpoint
+area: Ranking
+type: enhancement
+issues: []
+highlight:
+  title: Add multiple queries for ranking to the search endpoint
+  body: "The search endpoint adds a new top-level element called `sub_searches`. \
+  This top-level element is a list of searches used for ranking where each \
+  \"sub search\" is executed independently. The `sub_searches` element is \
+  used instead of `query` to allow a search using ranking to execute \
+  multiple queries. The `sub_searches` and `query` elements cannot be used \
+  together."
+  notable: true

docs/changelog/96605.yaml

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+pr: 96605
+summary: "Feature: include unit support for time series rate aggregation"
+area: TSDB
+type: enhancement
+issues:
+ - 94630

docs/changelog/96624.yaml

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+pr: 96624
+summary: Enable analytics geoip in behavioral analytics
+area: "Application"
+type: feature
+issues: []

docs/changelog/96712.yaml

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+pr: 96712
+summary: "Adjust ECS dynamic templates to support `subobjects: false`"
+area: Data streams
+type: enhancement
+issues: []

docs/changelog/96794.yaml

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+pr: 96794
+summary: Make TDigestState configurable
+area: Aggregations
+type: enhancement
+issues: []

docs/changelog/96821.yaml

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+pr: 96821
+summary: Change rollup thread pool settings
+area: TSDB
+type: enhancement
+issues:
+ - 96758

docs/changelog/96843.yaml

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+pr: 96843
+summary: Uses `ClusterSettings` instead of Node `Settings` in `HealthMetadataService`
+area: Health
+type: bug
+issues:
+ - 96219

docs/changelog/96863.yaml

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+pr: 96863
+summary: Add brute force approach to `GeoHashGridTiler`
+area: Geo
+type: enhancement
+issues: []

docs/changelog/96904.yaml

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+pr: 96904
+summary: Switch TDigestState to use `HybridDigest` by default
+area: Aggregations
+type: breaking
+issues: []
+breaking:
+  title: Switch TDigestState to use `HybridDigest` by default
+  area: REST API
+  details: "The default implementation for TDigest in percentile calculations switches\
+    \ to a new internal implementation offering superior performance (2x-10x speedup),\
+    \ at a very small accuracy penalty for very large sample populations."
+  impact: "This change leads to generating slightly different results in percentile\
+    \ calculations. If the highest possible accuracy is desired, or it's crucial to\
+    \ produce exactly the same results as in previous versions, one can either set\
+    \ `execution_hint` to `high_accuracy` in the `tdigest` spec of a given percentile\
+    \ calculation, or set `search.aggs.tdigest_execution_hint` to `high_accuracy`\
+    \ in cluster settings to apply to all percentile queries."
+  notable: true