adds semver violations to 2.1.4 release notes (#464)

Author: keith-turner

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

@@ -116,6 +116,24 @@ any prior 2.1 release.
   have more files than the maximum number of files per tablet.
 * {% ghi 5400 %} Modified AESCryptoService to prevent the creation of overlapping streams.
 
+### Semver violations
+
+The following are changes since 2.1.3 that violate semver.  Writing code that
+uses these new methods will make it incompatible with 2.1.3 and earlier.
+
+| Class | Changes |
+| ----- | ------- |
+| o.a.a.core.client.admin.InstanceOperations | added `Set<String> getCompactors()` |
+| o.a.a.core.client.admin.compaction.CompactionConfigurer.InitParameters | added `TabletId getTabletId()` and `URI getOutputFile()` |
+| o.a.a.core.client.rfile.RFile.WriterOptions | added `WriterOptions withSplitResolver(LoadPlan.SplitResolver splitResolver)` |
+| o.a.a.core.data.LoadPlan | added `String toJson()`, `LoadPlan fromJson(String json)`, `LoadPlan compute(...)`, `interface SplitResolver` |
+| o.a.a.core.data.TabletId | added `of(TableId tableId, String endRow, String prevEndRow)` and also added `Text` and `byte[]` versions |
+| o.a.a.core.iterators.IteratorEnvironment | removed default methods that threw UnsupportedOperationException |
+| o.a.a.core.spi.balancer.DoNothingBalancer | This entire class was added |
+| o.a.a.core.spi.balancer.TabletBalancer.BalanceParameters | added `String partitionName()`, `Map<String,TableId> getTablesToBalance()` |
+| o.a.a.core.spi.compaction.CompactionPlanner.PlanningParameters | added `NamespaceId getNamespaceId()` and `TabletId getTabletId()` |
+| o.a.a.core.spi.compaction.DefaultCompactionPlanner | added a new configuration option `tserver.compaction.major.service.<service>.opts.lowestRatio` |
+
 ## Requirements
 
 Accumulo 2.1.4 now requires JDK 17 to build, but still supports Java 11 runtime.