org.elasticsearch.indices.recovery.RecoveryTarget#restoreFileFromSnapshot does not check for cancellation during the download of a file. This means that if a recovery is cancelled mid-way, we will still not release the store/shard-lock until the file is fully downloaded.
For large files or slow downloads this can lead to problems when the shard is (re-)allocated to a node that is still executing such an interrupted recovery.

-> we need to add some checks for cancellation here like we have for other recovery modes.
x-pack/plugin/snapshot-based-recoveries/src/internalClusterTest/java/org/elasticsearch/xpack/snapshotbasedrecoveries/recovery/SnapshotBasedIndexRecoveryIT.java
RecoveryState recoveryState = getLatestPeerRecoveryStateForShard(indexName, 0);
        assertPeerRecoveryWasSuccessful(recoveryState, sourceNode, targetNode);
        InstrumentedRepo repository = getRepositoryOnNode(repoName, targetNode);
        long snapshotSizeForIndex = getSnapshotSizeForIndex(repoName, "snap", indexName);
        assertThat(repository.totalBytesRead.get(), is(greaterThan(0L)));
        assertThat(repository.totalBytesRead.get(), is(lessThanOrEqualTo(snapshotSizeForIndex)));
        assertDocumentsAreEqual(indexName, numDocs + docsIndexedAfterSnapshot);
    }
    public void testPeerRecoveryDoNotUseSnapshotsWhenSegmentsAreNotSharedAndSeqNosAreDifferent() throws Exception {
        String sourceNode = internalCluster().startDataOnlyNode();
        String indexName = randomAlphaOfLength(10).toLowerCase(Locale.ROOT);
        createIndex(
            indexName,
            indexSettings(1, 0).put(IndexService.GLOBAL_CHECKPOINT_SYNC_INTERVAL_SETTING.getKey(), "1s")
                .put("index.routing.allocation.require._name", sourceNode)
                .build()
        );
        int numDocs = randomIntBetween(300, 1000);
        indexDocs(indexName, 0, numDocs);
        String repoName = "repo";
        createRepo(repoName, TestRepositoryPlugin.INSTRUMENTED_TYPE);
        createSnapshot(repoName, "snap", Collections.singletonList(indexName));
        int docsIndexedAfterSnapshot = randomIntBetween(1, 2000);
        indexDocs(indexName, numDocs, docsIndexedAfterSnapshot);
        forceMerge();
        String targetNode = internalCluster().startDataOnlyNode();
        updateIndexSettings(Settings.builder().put("index.routing.allocation.require._name", targetNode), indexName);
        ensureGreen();
        RecoveryState recoveryState = getLatestPeerRecoveryStateForShard(indexName, 0);
        assertPeerRecoveryWasSuccessful(recoveryState, sourceNode, targetNode);