Reindexing takes 30 seconds and I don't want my search to be offline for 30 seconds every time I need to reindex. I'm trying to do this:
I can't seem to find any java code that does 1). Everything else is fine. Anyone? or is there another way that is better?
Using Elasticsearch 0.90.9.
Here is the method for your reference for finding all indices in a given aliasName:
public Set<String> getIndicesFromAliasName(String aliasName) {
IndicesAdminClient iac = client.admin().indices();
ImmutableOpenMap<String, List<AliasMetaData>> map = iac.getAliases(new GetAliasesRequest(aliasName))
.actionGet().getAliases();
final Set<String> allIndices = new HashSet<>();
map.keysIt().forEachRemaining(allIndices::add);
return allIndices;
}
You can use this to get all of the aliases:
client.admin().cluster()
.prepareState().execute()
.actionGet().getState()
.getMetaData().getAliases();
This returns a map with the index name as the key and the aliases as the value. So you can iterate over the map to get the index name.
a better solution would be , the map will have indexes as keys
GetAliasesResponse var = client.admin().indices().getAliases(new GetAliasesResponse var = client.admin().indices().getAliases(new GetAliasesRequest("merged")).actionGet();
ImmutableOpenMap<String, List<AliasMetaData>> v1 = var.getAliases();
With the latest API the accepted answer no longer works. Similar solution using latest client (5.2.0):
SortedMap<String, AliasOrIndex> lookup = esClient.admin().cluster()
.prepareState().execute()
.actionGet().getState()
.getMetaData().getAliasAndIndexLookup();
if (lookup.containsKey(ALIAS_NAME)) {
lookup.get(ALIAS_NAME).getIndices().get(0).getIndex().getName();
}
Alternatively, you can use Aliases API like this:
esClient.admin().indices().prepareGetAliases(ALIAS_NAME).get().getAliases();
Key of the resulting map is the index name that given alias maps to.
private String getIndexNameFromAliasName(final String aliasName) {
ImmutableOpenMap<String, AliasMetaData> indexToAliasesMap = client.admin().cluster()
.state(Requests.clusterStateRequest())
.actionGet()
.getState()
.getMetaData()
.aliases().get(aliasName);
if(indexToAliasesMap != null && !indexToAliasesMap.isEmpty()){
return indexToAliasesMap.keys().iterator().next().value;
}
return null;
}
