Varying hilightling behavior

Elastic Stack Elasticsearch
1

I am seeing some unexplainable behavior with highlighting returning different responses depending on the search text. Below are two examples of nearly identical queries with different search texts. I am not sure how to explain this?

Here is query 1. Notice I am searching for "log" as an exact match in translated_content.

        query = {
        "from": 0, "size": 5,
        '_source': ['translated_title',
                   'translated_content'],
        "query": {"bool": {
                "must": [ {"query_string": {"fields": ['translated_content', 'translated_title'],
                                            "query": "translated_content.exact:log"}}
                    ]

            }
        },
        "highlight": {'fields': [{'translated_content': {'number_of_fragments': 0}},
                                 {'translated_title': {'number_of_fragments': 0}}],
                    "require_field_match": False,
                      "highlight_query": {"bool": {"must": [{"query_string": {"fields": ['translated_content', 'translated_title'],
                                            "query": "translated_content.exact:log"}}]}}},
    }

The response for this is normal, as expected:

    _source:  {'translated_content': 'Very log i cant even log in', 'translated_title': ''}
    highlight:  {'translated_content': ['Very <em>log</em> i cant even <em>log</em> in']}
    _source:  {'translated_content': 'My account log out can not log in...why?', 'translated_title': 'Good'}
    highlight:  {'translated_content': ['My account <em>log</em> out can not <em>log</em> in...why?']}

Now here is the odd behavior. When I search for a different word, in this case 'image', I get no highlight response field. It is unclear what words return correctly with highlight and which do not.

        query = {
        "from": 0, "size": 5,
        '_source': ['translated_title',
                   'translated_content'],
        "query": {"bool": {
                "must": [ {"query_string": {"fields": ['translated_content', 'translated_title'],
                                            "query": "translated_content.exact:image"}}
                    ]

            }
        },
        "highlight": {'fields': [{'translated_content': {'number_of_fragments': 0}},
                                 {'translated_title': {'number_of_fragments': 0}}],
                    "require_field_match": False,
                      "highlight_query": {"bool": {"must": [{"query_string": {"fields": ['translated_content', 'translated_title'],
                                            "query": "translated_content.exact:image"}}]}}},
    }

Response:

    _source:  {'translated_content': 'Check this image', 'translated_title': 'Why band my id'}
highlight:  None
2

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