Updated 2.1.4 relnotes (#466)

Author: dlmarion

_posts/release/2025-04-08-accumulo-2.1.4.md

@@ -50,6 +50,12 @@ any prior 2.1 release.
   to the `accumulo-cluster` and `accumulo-service` scripts have been backported
   from the main branch. This includes syntax changes. Users should review the
   scripts for changes that may effect them.
+* {% ghi 5688 %} Added option to the Shell config command to show experimental properties.
+* {% ghi 5689 %} Modified tokenizer in Shell to provide better support for json values.
+* {% ghi 5726 %} Added new configuration properties for the Compactor to specify backoff
+  behavior when compactions are failing consecutively. This would likely occur when there
+  is a misconfiguration. This change also includes new logging in the Compactor and
+  Coordinator, and new metrics being emitted by the Compactor.
 
 ### Configuration Improvements
 
@@ -65,6 +71,8 @@ any prior 2.1 release.
   optionally compress these iterator options.
 * {% ghi 5633 %} Added a new property for server processes advertise address
   allowing different bind and advertise addresses.
+* {% ghi 5638 %} Added a new property to disable assignment and balancing when
+  the number of tserver is below the configured value. Disabled by default.
 
 
 ### Notable Bug Fixes
@@ -85,6 +93,7 @@ any prior 2.1 release.
   indefinitely reserved for a compaction that is no longer running.  This condition would continue until
   the tablet server hosting the tablet was restarted.
 * {% ghi 5543 %} {% ghi 5552 %} {% ghi 5543 %} Fixed multiple bugs that could destabilize external compactions.
+* {% ghi 5707 %} Fixes a bug where an exteranl compaction would not start.
 
 ### Metrics Improvements