Hello Rajesh,
As stated in Cloud Firestore in Datastore mode, the Cloud Firestore in Datastore mode uses Cloud Datastore indexes instead of Cloud Firestore indexes, therefore, the limitations are the same excepting for these 3 which are listed in the previous link:
-Eventual consistency, all Cloud Datastore queries become strongly consistent.
-Transactions are no longer limited to 25 entity groups.
-Writes to an entity group are no longer limited to 1 per second.
Please review production limits for the Cloud Datastore, the maximum number of composite indexes for a project is still 200.--
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Hi Rajesh,
This limit is infeasible to change due to complex infrastructure reasons. There is no update from Cloud Datastore engineering team regarding any alternative solutions for this limit as of yet and we unfortunately cannot provide any ETA at this moment.
It was discussed in the issue tracker, that alternates were being researched on this.Any updates that can shared on this.