== Options The **$$couchbase$$** $$sink$$ has the following options: //tag::configuration-properties[] Properties grouped by prefix: === couchbase.consumer $$bucket-expression$$:: $$A SpEL expression to specify the bucket.$$ *($$Expression$$, default: `$$<none>$$`)* $$collection-expression$$:: $$A SpEL expression to specify the collection.$$ *($$Expression$$, default: `$$<none>$$`)* $$key-expression$$:: $$A SpEL expression to specify the key.$$ *($$Expression$$, default: `$$<none>$$`)* $$value-expression$$:: $$A SpEL expression to specify the value (default is payload).$$ *($$Expression$$, default: `$$<none>$$`)* === spring.couchbase $$connection-string$$:: $$Connection string used to locate the Couchbase cluster.$$ *($$String$$, default: `$$<none>$$`)* $$password$$:: $$Cluster password.$$ *($$String$$, default: `$$<none>$$`)* $$username$$:: $$Cluster username.$$ *($$String$$, default: `$$<none>$$`)* //end::configuration-properties[]