Hello Ramya,
Please use this link to upload the file: https://upload.elastic.co/u/5f501789-e185-4fd5-a39a-acc746d426d3 . I suspect some interplay of size and complexity is the issue but would like to verify. Generally speaking, the GeoJSON uploader can handle the majority of files up to 50MB, but there are occasional exceptions and also local client factors that can affect this limit.
You might want to check out this other issue as well. It's a slightly different situation, but the advice would apply here. Regardless, I would appreciate the chance to look at the file. Then I can tell you if I'm seeing something similar and we'll have an additional data point to identify unhandled complexeties for this utility!
Regards,
Aaron