/**
* Returns a list containing all the names of existing snapshots in the configured repository
*
* @return List of string with the snapshot names
*/
public List<String> showSnapshots() {
ClusterAdminClient adminClient = this.clientFactory.client().admin().cluster();
GetSnapshotsRequestBuilder builder = new GetSnapshotsRequestBuilder(adminClient);
builder.setRepository(repoConfig.getName());
GetSnapshotsResponse getSnapshotsResponse = builder.execute().actionGet();
return getSnapshotsResponse
.getSnapshots()
.stream()
.map(SnapshotInfo::name)
.collect(Collectors.toList());
}
/**
* You cannot restore an open existing index, therefore we first check if an index exists that is
* in the snapshot. If the index exists we close the index before we start the restore action.
*
* @param snapshot String containing the name of the snapshot in the configured repository to
* restore
*/
public void restoreSnapshot(String snapshot) {
ClusterAdminClient adminClient = this.clientFactory.client().admin().cluster();
// Obtain the snapshot and check the indices that are in the snapshot
GetSnapshotsRequestBuilder builder = new GetSnapshotsRequestBuilder(adminClient);
builder.setRepository(repoConfig.getName());
builder.setSnapshots(snapshot);
GetSnapshotsResponse getSnapshotsResponse = builder.execute().actionGet();
// Check if the index exists and if so, close it before we can restore it.
ImmutableList<String> indices = getSnapshotsResponse.getSnapshots().get(0).indices();
CloseIndexRequestBuilder closeIndexRequestBuilder =
new CloseIndexRequestBuilder(this.clientFactory.client().admin().indices());
closeIndexRequestBuilder.setIndices(indices.toArray(new String[indices.size()]));
closeIndexRequestBuilder.execute().actionGet();
// Now execute the actual restore action
RestoreSnapshotRequestBuilder restoreBuilder = new RestoreSnapshotRequestBuilder(adminClient);
restoreBuilder.setRepository(repoConfig.getName()).setSnapshot(snapshot);
restoreBuilder.execute().actionGet();
logger.info("The snapshot {} is restored", snapshot);
}