Tensor prefiltering not working for fields with spaces [BUG]

[pandu-k]

Describe the bug
Tensor prefiltering not working for fields with spaces. When a filter is applied to a field with a space, no documents are retrieved.

To Reproduce
Steps to reproduce the behavior:

1. Have Marqo running
2. Index some documents. One should have a field with a space in it:

curl -XPOST  'http://localhost:8882/indexes/my-irst-ix/documents?refresh=true&device=cpu' -H 'Content-type:application/json' -d '
[ 
    {
        "Title": "Honey is a delectable food stuff", 
        "Desc" : "some boring description",
        "_id": "honey_facts_119",
        "gapped field": "wololo"
    }, {
        "Title": "Space exploration",
        "Desc": "mooooon! Space!!!!",
        "_id": "moon_fact_145"
    }
]'

Doing a filtered lexical search works (document id: "honey_facts_119" is retrieved):

curl -XPOST  'http://localhost:8882/indexes/my-irst-ix/search?device=cpu' -H 'Content-type:application/json' -d '{
    "q": "what do bears eat?",
    "searchMethod": "LEXICAL",
    "filter": "gapped\\ field:wololo"
}'

But doing a filtered tensor search doesn't (document id: "honey_facts_119" isn't retrieved):

curl -XPOST  'http://localhost:8882/indexes/my-irst-ix/search?device=cpu' -H 'Content-type:application/json' -d '{
    "q": "what do bears eat?",
    "searchMethod": "TENSOR",
    "filter": "gapped\\ field:wololo"
}'

Expected behavior
When a filter is applied to a field with a space, the documents should be retrieved, in the same way it is for lexical search

Desktop (please complete the following information):

• OS: Ubuntu amd64
• Version 0.0.3

Additional context
Add any other context about the problem here.

[PawanPatil19]

Can you assign this issue to me?

[pandu-k]

Looking at this issue, I think it's a problem with Marqo-os kNN filtering having trouble parsing fields with spaces, or at least with escaping the space with a backslash.

What solution are you thinking of @PawanPatil19 ?

[pandu-k]

Resolved by #213