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Elasticsearch version 7.8.0

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Elasticsearch version 7.8.0

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Also see Breaking changes in 7.8.

Known issues

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  • SQL: If a WHERE clause contains at least two relational operators joined by AND, of which one is a comparison (<=, <, >=, >) and another one is an inequality (!=, <>), both against literals or foldable expressions, the inequality will be ignored. The workaround is to substitute the inequality with a NOT IN operator.

    We have fixed this issue in Elasticsearch 7.10.1 and later versions. For more details, see #65488.

  • Parsing a request when the last element in an array is filtered out (for instance using _source_includes) fails. This is due to a bug in Jackson parser. Fixed in Elasticsearch 8.6.1 (#91456)
  • The deprecated index.mapper.dynamic setting can break your cluster. It can only be set using the Update index settings API. Symptoms include nodes failing to start or shards failing to allocate. Do not use this setting in versions prior to 7.17.22. The bug is fixed in 7.17.22. (issue: #109160)

Breaking changes

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Aggregations
  • value_count aggregation optimization #54854
Features/Indices APIs
  • Add auto create action #55858
Mapping
  • Disallow changing enabled on the root mapper #54463 (issue: #33933)
  • Fix updating include_in_parent/include_in_root of nested field #54386 (issue: #53792)

Deprecations

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Authentication
  • Deprecate the kibana reserved user; introduce kibana_system user #54967
Cluster Coordination
  • Voting config exclusions should work with absent nodes #50836 (issue: #47990)
Features/Features
  • Add node local storage deprecation check #54383 (issue: #54374)
Features/Indices APIs
  • Deprecate local parameter for get field mapping request #55014
Infra/Core
  • Deprecate node local storage setting #54374
Infra/Plugins

New features

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Aggregations
  • Add Student’s t-test aggregation support #54469 (issue: #53692)
  • Add support for filters to t-test aggregation #54980 (issue: #53692)
  • Histogram field type support for Sum aggregation #55681 (issue: #53285)
  • Histogram field type support for ValueCount and Avg aggregations #55933 (issue: #53285)
Features/Indices APIs
  • Add simulate template composition API _index_template/_simulate_index/{name} #55686 (issue: #53101)
Geo
  • Add geo_bounds aggregation support for geo_shape #55328
  • Add geo_shape support for geotile_grid and geohash_grid #55966
  • Add geo_shape support for the geo_centroid aggregation #55602
  • Add new point field #53804
SQL

Enhancements

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Aggregations
  • Aggs must specify a field or script (or both) #52226
  • Expose aggregation usage in Feature Usage API #55732 (issue: #53746)
  • Reduce memory for big aggregations run against many shards #54758
  • Save memory in on aggs in async search #55683
Allocation
  • Disk decider respect watermarks for single data node #55805
  • Improve same-shard allocation explanations #56010
Analysis
  • Add preserve_original setting in ngram token filter #55432
  • Add preserve_original setting in edge ngram token filter #55766 (issue: #55767)
  • Add pre-configured “lowercase” normalizer #53882 (issue: #53872)
Audit
  • Update the audit logfile list of system users #55578 (issue: #37924)
Authentication
  • Let realms gracefully terminate the authN chain #55623
Authorization
  • Add reserved_ml_user and reserved_ml_admin kibana privileges #54713
Autoscaling
  • Rollover: refactor out cluster state update #53965
CRUD
  • Avoid holding onto bulk items until all completed #54407
Cluster Coordination
  • Add voting config exclusion add and clear API spec and integration test cases #55760 (issue: #48131)
Features/CAT APIs
  • Add support for V2 index templates to /_cat/templates #55829 (issue: #53101)
Features/Indices APIs
  • Add HLRC support for simulate index template api #55936 (issue: #53101)
  • Add prefer_v2_templates flag and index setting #55411 (issue: #53101)
  • Add warnings/errors when V2 templates would match same indices as V1 #54367 (issue: #53101)
  • Disallow merging existing mapping field definitions in templates #57701 (issues: #55607, #55982, #57393)
  • Emit deprecation warning if multiple v1 templates match with a new index #55558 (issue: #53101)
  • Guard adding the index.prefer_v2_templates settings for pre-7.8 nodes #55546 (issues: #53101, #55411, #55539)
  • Handle merging dotted object names when merging V2 template mappings #55982 (issue: #53101)
  • Throw exception on duplicate mappings metadata fields when merging templates #57835 (issue: #57701)
  • Update template v2 api rest spec #55948 (issue: #53101)
  • Use V2 index templates during index creation #54669 (issue: #53101)
  • Use V2 templates when reading duplicate aliases and ingest pipelines #54902 (issue: #53101)
  • Validate V2 templates more strictly #56170 (issues: #43737, #46045, #53101, #53970)
Features/Java High Level REST Client
  • Enable support for decompression of compressed response within RestHighLevelClient #53533
Features/Stats
  • Fix available / total disk cluster stats #32480 (issue: #32478)
Features/Watcher
Geo
  • Add geo_shape mapper supporting doc-values in Spatial Plugin #55037 (issue: #53562)
Infra/Core
  • Decouple Environment from DiscoveryNode #54373
  • Ensure that the output of node roles are sorted #54376 (issue: #54370)
  • Reintroduce system index APIs for Kibana #54858 (issues: #52385, #53912)
  • Schedule commands in current thread context #54187 (issue: #17143)
  • Start resource watcher service early #54993 (issue: #54867)
Infra/Packaging
  • Make Windows JAVA_HOME handling consistent with Linux #55261 (issue: #55134)
Infra/REST API
  • Add validation to the usage service #54617
Infra/Scripting
  • Scripting: stats per context in nodes stats #54008 (issue: #50152)
Machine Learning
  • Add effective max model memory limit to ML info #55529 (issue: #63942)
  • Add loss_function to regression #56118
  • Add new inference_config field to trained model config #54421
  • Add failed_category_count to model_size_stats #55716 (issue: #1130)
  • Add prediction_field_type to inference config #55128
  • Allow a certain number of ill-formatted rows when delimited format is specified #55735 (issue: #38890)
  • Apply default timeout in StopDataFrameAnalyticsAction.Request #55512
  • Create an annotation when a model snapshot is stored #53783 (issue: #52149)
  • Do not execute ML CRUD actions when upgrade mode is enabled #54437 (issue: #54326)
  • Make find_file_structure recognize Kibana CSV report timestamps #55609 (issue: #55586)
  • More advanced model snapshot retention options #56125 (issue: #52150)
  • Return assigned node in start/open job/datafeed response #55473 (issue: #54067)
  • Skip daily maintenance activity if upgrade mode is enabled #54565 (issue: #54326)
  • Start gathering and storing inference stats #53429
  • Unassign data frame analytics tasks in SetUpgradeModeAction #54523 (issue: #54326)
  • Speed up anomaly detection for the lat_long function #1102
  • Reduce CPU scheduling priority of native analysis processes to favor the ES JVM when CPU is constrained. This change is implemented only for Linux and macOS, not for Windows #1109
  • Take training_percent into account when estimating memory usage for classification and regression #1111
  • Support maximize minimum recall when assigning class labels for multiclass classification #1113
  • Improve robustness of anomaly detection to bad input data #1114
  • Add new num_matches and preferred_to_categories fields to category output #1062
  • Add mean squared logarithmic error (MSLE) for regression #1101
  • Add pseudo-Huber loss for regression #1168
  • Reduce peak memory usage and memory estimates for classification and regression #1125.)
  • Reduce variability of classification and regression results across our target operating systems #1127
  • Switch data frame analytics model memory estimates from kilobytes to megabytes #1126 (issue: #54506)
  • Add a machine learning native code build for Linux on AArch64 #1132, #1135
  • Improve data frame analytics runtime by optimising memory alignment for intrinsic operations #1142
  • Fix spurious anomalies for count and sum functions after no data are received for long periods of time #1158
  • Improve false positive rates from periodicity test for time series anomaly detection #1177
  • Break progress reporting of data frame analyses into multiple phases #1179
  • Really centre the data before training for classification and regression begins. This means we can choose more optimal smoothing bias and should reduce the number of trees #1192
Mapping
  • Merge V2 index/component template mappings in specific manner #55607 (issue: #53101)
Recovery
  • Avoid copying file chunks in peer recovery #56072 (issue: #55353)
  • Retry failed peer recovery due to transient errors #55353
SQL
  • Add BigDecimal support to JDBC #56015 (issue: #43806)
  • Drop BASE TABLE type in favour for just TABLE #54836
  • Relax version lock between server and clients #56148
Search
  • Consolidate DelayableWriteable #55932
  • Exists queries to MatchNoneQueryBuilder when the field is unmapped #54857
  • Rewrite wrapper queries to match_none if possible #55271
  • SearchService#canMatch takes into consideration the alias filter #55120 (issue: #55090)
Snapshot/Restore
  • Add GCS support for searchable snapshots #55403
  • Allocate searchable snapshots with the balancer #54889 (issues: #50999, #54729)
  • Allow bulk snapshot deletes to abort #56009 (issue: #55773)
  • Allow deleting multiple snapshots at once #55474
  • Allow searching of snapshot taken while indexing #55511 (issue: #50999)
  • Allow to prewarm the cache for searchable snapshot shards #55322
  • Enable prewarming by default for searchable snapshots #56201 (issue: #55952)
  • Permit searches to be concurrent to prewarming #55795
  • Reduce contention in CacheFile.fileLock() method #55662
  • Require soft deletes for searchable snapshots #55453
  • Searchable Snapshots should respect max_restore_bytes_per_sec #55952
  • Update the HDFS version used by HDFS Repo #53693
  • Use streaming reads for GCS #55506 (issue: #55505)
  • Use workers to warm cache parts #55793 (issue: #55322)
Task Management
  • Add indexName in update-settings task name #55714
  • Add scroll info to search task description #54606
  • Broadcast cancellation to only nodes have outstanding child tasks #54312 (issues: #50990, #51157)
  • Support hierarchical task cancellation #54757 (issue: #50990)
Transform

Bug fixes

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Aggregations
  • Add analytics plugin usage stats to _xpack/usage #54911 (issue: #54847)
  • Aggregation support for Value Scripts that change types #54830 (issue: #54655)
  • Allow terms agg to default to depth first #54845
  • Clean up how pipeline aggs check for multi-bucket #54161 (issue: #53215)
  • Fix auto_date_histogram serialization bug #54447 (issues: #54382, #54429)
  • Fix error massage for unknown value type #55821 (issue: #55727)
  • Fix scripted metric in CCS #54776 (issue: #54758)
  • Use Decimal formatter for Numeric ValuesSourceTypes #54366 (issue: #54365)
Allocation
  • Fix Broken ExistingStoreRecoverySource Deserialization #55657 (issue: #55513)
Features/ILM+SLM
  • ILM stop step execution if writeIndex is false #54805
Features/Indices APIs
  • Fix NPE in MetadataIndexTemplateService#findV2Template #54945
  • Fix creating filtered alias using now in a date_nanos range query failed #54785 (issue: #54315)
  • Fix simulating index templates without specified index #56295 (issues: #53101, #56255)
  • Validate non-negative priorities for V2 index templates #56139 (issue: #53101)
Features/Watcher
  • Ensure watcher email action message ids are always unique #56574
Infra/Core
Machine Learning
  • Fix GET _ml/inference so size param is respected #57303 (issue: #57298)
  • Fix file structure finder multiline merge max for delimited formats #56023
  • Validate at least one feature is available for DF analytics #55876 (issue: #55593)
  • Trap and fail if insufficient features are supplied to data frame analyses. Otherwise, classification and regression got stuck at zero analyzing progress #1160 (issue: #55593)
  • Make categorization respect the model_memory_limit #1167 (issue: #1130)
  • Respect user overrides for max_trees for classification and regression #1185
  • Reset memory status from soft_limit to ok when pruning is no longer required #1193 (issue: #1131)
  • Fix restore from training state for classification and regression #1197
  • Improve the initialization of seasonal components for anomaly detection #1201 (issue: #1178)
Network
  • Fix issue with pipeline releasing bytes early #54458
  • Handle TLS file updates during startup #54999 (issue: #54867)
SQL
  • Fix DATETIME_PARSE behaviour regarding timezones #56158 (issue: #54960)
Search
  • Don’t expand default_field in query_string before required #55158 (issue: #53789)
  • Fix time_zone for query_string and date fields #55881 (issue: #55813)
Security
  • Fix certutil http for empty password with JDK 11 and lower #55437 (issue: #55386)
Transform
  • Fix count when matching exact ids #56544 (issue: #56196)
  • Fix http status code when bad scripts are provided #56117 (issue: #55994)

Regressions

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Infra/Scripting
  • Don’t double-wrap expression values #54432 (issue: #53661)
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