"es-" meaning in Asturian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ast",
        "2": "la",
        "3": "ex"
      },
      "expansion": "Latin ex",
      "name": "der"
    }
  ],
  "etymology_text": "From Latin ex.",
  "head_templates": [
    {
      "args": {
        "1": "ast",
        "2": "prefix"
      },
      "expansion": "es-",
      "name": "head"
    }
  ],
  "lang": "Asturian",
  "lang_code": "ast",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Asturian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 8 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "es- + fueya (“leaf”) → esfoyar (“to remove leaves from”)",
          "type": "example"
        },
        {
          "text": "es- + guedeyu (“tuft”) → esguedeyar (“to muss”)",
          "type": "example"
        }
      ],
      "glosses": [
        "indicates movement away or separation"
      ],
      "id": "en-es--ast-prefix-P0zxwwBy",
      "related": [
        {
          "word": "des-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "es-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ast",
        "2": "la",
        "3": "ex"
      },
      "expansion": "Latin ex",
      "name": "der"
    }
  ],
  "etymology_text": "From Latin ex.",
  "head_templates": [
    {
      "args": {
        "1": "ast",
        "2": "prefix"
      },
      "expansion": "es-",
      "name": "head"
    }
  ],
  "lang": "Asturian",
  "lang_code": "ast",
  "pos": "prefix",
  "related": [
    {
      "word": "des-"
    }
  ],
  "senses": [
    {
      "categories": [
        "Asturian entries with incorrect language header",
        "Asturian lemmas",
        "Asturian prefixes",
        "Asturian terms derived from Latin",
        "Pages with 8 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "es- + fueya (“leaf”) → esfoyar (“to remove leaves from”)",
          "type": "example"
        },
        {
          "text": "es- + guedeyu (“tuft”) → esguedeyar (“to muss”)",
          "type": "example"
        }
      ],
      "glosses": [
        "indicates movement away or separation"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "es-"
}