[TEST] Wait for no pending operations on the index shard (#118244)

This fixes testRetryPointInTime which on teardown is looking to assert
that the operations in the translog and in the lucene index are the
same.

Previously we didn't wait for the translog operations to be applied.
This changes `assertConsistentHistoryInLuceneIndex` to wait for the
pending operations in the translog to be applied.

Fixes #117116

Author: andreidan

muted-tests.yml

@@ -157,9 +157,6 @@ tests:
 - class: org.elasticsearch.xpack.test.rest.XPackRestIT
   method: test {p0=snapshot/10_basic/Create a source only snapshot and then restore it}
   issue: https://github.com/elastic/elasticsearch/issues/117295
-- class: org.elasticsearch.xpack.searchablesnapshots.RetrySearchIntegTests
-  method: testRetryPointInTime
-  issue: https://github.com/elastic/elasticsearch/issues/117116
 - class: org.elasticsearch.xpack.inference.DefaultEndPointsIT
   method: testInferDeploysDefaultElser
   issue: https://github.com/elastic/elasticsearch/issues/114913

test/framework/src/main/java/org/elasticsearch/snapshots/AbstractSnapshotIntegTestCase.java

@@ -128,6 +128,7 @@ protected Collection<Class<? extends Plugin>> nodePlugins() {
 
     @After
     public void assertConsistentHistoryInLuceneIndex() throws Exception {
+        internalCluster().beforeIndexDeletion();
         internalCluster().assertConsistentHistoryBetweenTranslogAndLuceneIndex();
     }