Does AWS Glue Elastic Views support S3 as source?

At the time of publishing this answer, per AWS Glue FAQ

Currently supported sources for the preview include Amazon DynamoDB, with support for Amazon Aurora MySQL, Amazon Aurora PostgreSQL, Amazon RDS for MySQL, and Amazon RDS for PostgreSQL to follow. Currently supported targets are Amazon Redshift, Amazon S3, and Amazon Elasticsearch Service, with support for Amazon Aurora MySQL, Amazon Aurora PostgreSQL, Amazon RDS for MySQL, and Amazon RDS for PostgreSQL to follow.*

It is highly recommended to check FAQs or work with your AWS team to get accurate information from time to time on supported source and target endpoints.