Django command to load batch work embedding into ES

[albertisfu]

Once #4559 is completed. We'd require creating this command that pulls up embeddings from S3 and indexes them into ES using a bulk update operation with a reasonable batch size that ES can handle properly.

• As part of this task, we can must tweak the Opinion index mapping to support the embeddings storage.

• Evaluate ES workload to determine if the cluster can handle this load beside the regular index and other bulk tasks running related to the ES cluster.

The output of this issue would be:

• A PR that includes the Django command to pulls up embeddings from S3 and index them to ES.