[[start-resume-reindex]]
=== Start or resume reindex API
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<titleabbrev>Start or resume reindex</titleabbrev>
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experimental[] Start a new reindex or resume a paused reindex.

Start a new reindex or resume a paused reindex.

[[start-resume-reindex-request]]
==== Request

`POST <kibana host>:<port>/api/upgrade_assistant/reindex/myIndex`

[[start-resume-reindex-codes]]
==== Response code

`200`::
  Indicates a successful call.

[[start-resume-reindex-example]]
==== Example

The API returns the following:

[source,sh]
--------------------------------------------------
{
  "indexName": ".ml-state",
  "newIndexName": ".reindexed-v7-ml-state", <1>
  "status": 0, <2>
  "lastCompletedStep": 0, <3>
  "reindexTaskId": null, <4>
  "reindexTaskPercComplete": null, <5>
  "errorMessage": null <6>
}
--------------------------------------------------

<1> The name of the new index.
<2> The reindex status. For more information, refer to <<status-code,Status codes>>.
<3> The last successfully completed step of the reindex. For more information, refer to <<step-code,Step codes>>.
<4> The task ID of the reindex task in {es}. Appears when the reindexing starts.
<5> The progress of the reindexing task in {es}. Appears in decimal form, from 0 to 1.
<6> The error that caused the reindex to fail, if it failed.