[BUG] Unable to Edit Report Definition by request time from Recurring to Cron based and from Cron based to Recurring

[Sangeetha14]

What is the bug?
Unable to Edit Report Definition by request time from Recurring to Cron based and from Cron based to Recurring.

How can one reproduce the bug?
Steps to reproduce the behavior:
Bug 1: Edit request time from Recurring to Cron based

1. Create report definition with request time Recurring

Query Execution:
curl -X GET "localhost:9200/_plugins/_reports/definition/QRebUpIBg7m4Lu8dXvJT?pretty" -H 'Content-Type: application/json' -d'{"from":0,"size":10000,"timeout":"60000ms","query":{"terms":{"tenant":[""],"boost":1.0}},"sort":[{"lastUpdatedTimeMs":{"order":"asc"}}]}'

2. Edit the Report by request time from Recurring to Cron based

Query Execution:
curl -X GET "localhost:9200/_plugins/_reports/definition/QRebUpIBg7m4Lu8dXvJT?pretty" -H 'Content-Type: application/json' -d'{"from":0,"size":10000,"timeout":"60000ms","query":{"terms":{"tenant":[""],"boost":1.0}},"sort":[{"lastUpdatedTimeMs":{"order":"asc"}}]}'

Note: Within schedule "interval" is not updated to "cron"

3. But it is not updated in Report Definition

Bug 2: Edit request time from Cron based to Recurring

1. Create report definition with request time Cron based
2. Edit the Report by request time from Cron based to Recurring
3. But it is not updated in Report Definition
   Note: Same as Bug1

What is the expected behavior?
The Report Definition Edit should be work properly.

Do you have any additional context?
Actually we observed "In Edit report definition both interval and cron are available in data" by executing the query
curl -XGET "http://localhost:9200/.opendistro-reports-definitions/_search?pretty" -H 'Content-Type: application/json' -d' {"from":0,"size":10000,"timeout":"60000ms","query":{"terms":{"tenant":[""],"boost":1.0}},"sort":[{"lastUpdatedTimeMs":{"order":"asc"}}]}'