I have an application in
A very simple and valid option is to use gcloud .
gcloud preview datastore cleanup-indexes ~ / app / index.yaml
You can also quickly rebuild by this means, create-indexes
First you must remove the indexes that you do not need from your xml file.
important : If you do not know if an index is used, do not remove it. It is not possible to reverse this operation.
You need to use the vacuum-indexes command.
For xml , you can use appcfg.sh vacuum_indexes <el-directorio-de-tu-aplicación> or if you use Maven you can use maven mvn:vacuum_indexes .
For more information, I recommend reading cleanup-indexes . (This command is only for yaml , but the concepts are similar).
These indexes are defined from manual way . If you did not create this file, it was probably created from automatically, running queries in the development environment.
The automatic file is in WEB-INF/appengine-generated/datastore-indexes-auto.xml , but you should find the definitive file in WEB-INF/datastore-indexes.xml , the latter is the one that you should clean so that the indexes in the server are removed.