# Full text search in Amazon Neptune using Amazon OpenSearch Service
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Neptune integrates with [Amazon OpenSearch Service (OpenSearch Service)](https://docs.amazonaws.cn/opensearch-service/latest/developerguide/) to support full-text search in both Gremlin and SPARQL queries.

Starting with [engine release 1.3.0.0](engine-releases-1.3.0.0.md), Amazon Neptune supports using [Amazon OpenSearch Service Serverless](https://docs.amazonaws.cn/opensearch-service/latest/developerguide/serverless.html) for full-text search in Gremlin and SPARQL queries.

**Note**  
When integrating with Amazon OpenSearch Service, Neptune requires Elasticsearch version 7.1 or higher, and works with OpenSearch 2.3, 2.5 and above. Neptune also works with [OpenSearch Serverless](full-text-search-serverless.md).

You can use Neptune with an existing OpenSearch Service cluster that has been populated according to the [Neptune data model for OpenSearch data](full-text-search-model.md). Or, you can create an OpenSearch Service domain linked with Neptune using an Amazon CloudFormation stack.

**Important**  
The Neptune to OpenSearch replication process described here does not replicate blank nodes. This is an important limitation to note.  
Also, if you enable [fine-grained access control](https://docs.amazonaws.cn/opensearch-service/latest/developerguide/fgac.html) on your OpenSearch cluster, you need to [enable IAM authentication](iam-auth-enable.md) in your Neptune database as well.

![Neptune open search stream poller architecture layout.](http://docs.amazonaws.cn/en_us/neptune/latest/userguide/images/poller-architecture.PNG)


**Topics**
+ [Amazon Neptune-to-OpenSearch replication](full-text-search-cfn-setup.md)
+ [Replication to OpenSearch Serverless](full-text-search-serverless.md)
+ [Querying from an OpenSearch cluster with Fine-grained access control (FGAC) enabled](full-text-search-fgac.md)
+ [Using Apache Lucene query syntax in Neptune full-text search queries](full-text-search-lucene.md)
+ [Neptune data model for OpenSearch data](full-text-search-model.md)
+ [Neptune full-text search parameters](full-text-search-parameters.md)
+ [Non-string OpenSearch indexing in Amazon Neptune](full-text-search-non-string-indexing.md)
+ [Full-text-search query execution in Amazon Neptune](full-text-search-query-execution.md)
+ [Sample SPARQL queries using full-text search in Neptune](full-text-search-sparql-examples.md)
+ [Using Neptune full-text search in Gremlin queries](full-text-search-gremlin.md)
+ [Troubleshooting Neptune full-text search](streams-consumer-troubleshooting.md)