Disable auto index creation

[farshidz]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Feature

• What is the current behavior? (You can also link to an open issue here)
  When adding documents to an index that does not exist, Marqo automatically and silently creates an index with a default index configuration.

• What is the new behavior (if this is a feature change)?
  Attempting to add documents to an index that does not exist will fail with an error. Indices must be created explicitly before adding documents.
  See Disable auto create index marqo#516

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  Yes. Users must ensure an index exists before documents are added, or must handle the error. Code that relies on the removed automatic index creation behaviour will fail.

• Other information:

[Mehul-Porwal]

You may want to squash the commits before merging

[pandu-k]

You may want to squash the commits before merging

good point - I've disabled other merge methods