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## 5.1. Introduction

Indexing operations are part of the Neo4j index API.

Each index is tied to a unique, user-specified name (for example "first_name" or "books") and can index either nodes or relationships.

The default index implementation is provided by the `neo4j-lucene-index` component, which is included in the standard Neo4j download. It can also be downloaded separately from http://repo1.maven.org/maven2/org/neo4j/neo4j-lucene-index/ . For Maven users, the `neo4j-lucene-index` component has the coordinates `org.neo4j:neo4j-lucene-index` and should be used with the same version of `org.neo4j:neo4j-kernel`. Different versions of the index and kernel components are not compatible in the general case. Both components are included transitively by the `org.neo4j:neo4j:pom` artifact which makes it simple to keep the versions in sync.

| Note
All modifying index operations must be performed inside a transaction, as with any mutating operation in Neo4j.

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