Add release notes for 7.9.1 (#61861) (#61937)

Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
Co-authored-by: Lisa Cawley <lcawley@elastic.co>

Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: Lisa Cawley <lcawley@elastic.co>
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Also see <<breaking-changes-7.9,Breaking changes in 7.9>>.
[[feature-7.9.1]]
[float]
=== New features
Search::
* QL: Wildcard field type support {es-pull}58062[#58062] (issues: {es-issue}54184[#54184], {es-issue}58044[#58044])
[[enhancement-7.9.1]]
[float]
=== Enhancements
CRUD::
* Log more information when mappings fail on index creation {es-pull}61577[#61577]
EQL::
* Make endsWith function use a wildcard ES query wherever possible {es-pull}61160[#61160] (issue: {es-issue}61154[#61154])
* Make stringContains function use a wildcard ES query wherever possible {es-pull}61189[#61189] (issue: {es-issue}58922[#58922])
Features/Stats::
* Change severity of negative stats messages from WARN to DEBUG {es-pull}60375[#60375]
Search::
* Fix handling of alias filter in SearchService#canMatch {es-pull}59368[#59368] (issue: {es-issue}59367[#59367])
* QL: Add filtering Query DSL support to IndexResolver {es-pull}60514[#60514] (issue: {es-issue}57358[#57358])
Snapshot/Restore::
* Do not access snapshot repo on dedicated voting-only master node {es-pull}61016[#61016] (issue: {es-issue}59649[#59649])
[[bug-7.9.1]]
[float]
=== Bug fixes
Authentication::
* Call ActionListener.onResponse exactly once {es-pull}61584[#61584]
Authorization::
* Relax the index access control check for scroll searches {es-pull}61446[#61446]
CCR::
* Relax ShardFollowTasksExecutor validation {es-pull}60054[#60054] (issue: {es-issue}59625[#59625])
* Set timeout of auto put-follow request to unbounded {es-pull}61679[#61679] (issue: {es-issue}56891[#56891])
* Set timeout of master node requests on follower to unbounded {es-pull}60070[#60070] (issue: {es-issue}56891[#56891])
Cluster Coordination::
* Restrict testing of legacy discovery to tests {es-pull}61178[#61178] (issue: {es-issue}61177[#61177])
EQL::
* Return sequence join keys in the original type {es-pull}61268[#61268] (issue: {es-issue}59707[#59707])
Features/Data streams::
* "no such index [null]" when indexing into data stream with op_type=index [ISSUE] {es-pull}60581[#60581]
* Data streams: throw ResourceAlreadyExists exception {es-pull}60518[#60518]
* Track backing indices in data streams stats from cluster state {es-pull}59817[#59817]
Features/ILM+SLM::
* Fix race in SLM master/cluster state listeners {es-pull}59801[#59801]
Features/Ingest::
* Fix handling of final pipelines when destination is changed {es-pull}59522[#59522] (issue: {es-issue}57968[#57968])
* Fix wrong pipeline name in debug log {es-pull}58817[#58817] (issue: {es-issue}58478[#58478])
* Fix wrong result when executing bulk requests with and without pipeline {es-pull}60818[#60818] (issue: {es-issue}60437[#60437])
* Update regex file for es user agent node processor {es-pull}59697[#59697] (issue: {es-issue}59694[#59694])
IdentityProvider::
* Only call listener once (SP template registration) {es-pull}60497[#60497] (issues: {es-issue}54285[#54285], {es-issue}54423[#54423])
Machine Learning::
* Always write prediction_probability and prediction_score for classification inference {es-pull}60335[#60335]
* Get data frame analytics stats API can return multiple responses if more than one error {es-pull}60900[#60900] (issue: {es-issue}60876[#60876])
* Ensure .ml-config index is updated before clearing anomaly job's finished_time {es-pull}61064[#61064] (issue: {es-issue}61157[#61157])
* Ensure annotations index mappings are up to date {es-pull}61107[#61107] (issue: {es-issue}74935[#74935])
* Handle node closed exception in ML result processing {es-pull}60238[#60238] (issue: {es-issue}60130[#60130])
* Recover data frame extraction search from latest sort key {es-pull}61544[#61544]
SQL::
* Fix NPE on ambiguous GROUP BY {es-pull}59370[#59370] (issues: {es-issue}46396[#46396], {es-issue}56489[#56489])
* Fix SYS COLUMNS schema in ODBC mode {es-pull}59513[#59513] (issue: {es-issue}59506[#59506])
Search::
* Disable sort optimization on search collapsing {es-pull}60838[#60838]
* Search fix: query_string regex searches not working on wildcard fields {es-pull}60959[#60959] (issue: {es-issue}60957[#60957])
Snapshot/Restore::
* Cleanly Handle S3 SDK Exceptions in Request Counting {es-pull}61686[#61686] (issue: {es-issue}61670[#61670])
* Fix Concurrent Snapshot Create+Delete + Delete Index {es-pull}61770[#61770] (issue: {es-issue}61762[#61762])
[[upgrade-7.9.1]]
[float]
=== Upgrades
Infra/Core::
* Upgrade to Lucene 8.6.2 {es-pull}61688[#61688] (issue: {es-issue}61512[#61512])
[[release-notes-7.9.0]]
== {es} version 7.9.0